CVE-2025-39964
HIGH 7.8 KNOWN EXPLOITED ALL-YEARSIn the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.
ACTIVELY EXPLOITED
Confirmed exploited in the wild — in CISA KEV since 2026-09-18. Patch or mitigate now.
Exploitation likelihood
1.6%chance of exploitation in 30 days · 75th percentile
● In CISA KEV (2026-09-18)○ Catalogued PoC◆ SSVC: exploitation active, automatable no
Impact if exploited
7.8CVSS 3.1 · HIGH · CNA
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
Search GitHub now — results may be empty or unverified.
Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Affected
Products Linux Simatic S7 1500 Cpu 1518 4 Pn/Dp Mfp Simatic S7 1500 Cpu 1518f 4 Pn/Dp Mfp Siplus S7 1500 Cpu 1518 4 Pn/Dp Mfp Linux Kernel Simatic S7 1500 Cpu 1518 4 Pn\/Dp Mfp Firmware Simatic S7 1500 Cpu 1518 4 Pn\/Dp Mfp Simatic S7 1500 Cpu 1518f 4 Pn\/Dp Mfp Firmware Simatic S7 1500 Cpu 1518f 4 Pn\/Dp Mfp
Weakness (CWE)
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References and research data (JSON)
Vendor product assessments
Showing 32 of 2347 vendor product statements; 2315 omitted. Read the full vendor advisory.
kernel-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10 · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]?arch=aarch64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-debuginfo-common-ppc64-0:3.10.0-1160.164.1.el7.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]?arch=ppc64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
python3-perf-0:6.12.0-55.106.1.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_0?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
perf-0:5.14.0-284.194.1.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_2?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
libperf-debuginfo-0:5.14.0-570.143.1.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_6?arch=s390x
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-debug-modules-0:6.12.0-55.106.1.el10_0.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_0?arch=ppc64le
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-modules-extra-0:6.12.0-211.58.1.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_2?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
python3-perf-debuginfo-0:4.18.0-553.166.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_10?arch=ppc64le
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-debuginfo-common-x86_64-0:4.18.0-372.218.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_6?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-modules-0:4.18.0-477.170.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_8?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
perf-debuginfo-0:5.14.0-284.194.1.el9_2.s390x as a component of Red Hat Enterprise Linux BaseOS E4S (v.9.2) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_2?arch=s390x
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-64k-modules-0:5.14.0-570.143.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_6?arch=aarch64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-debuginfo-0:5.14.0-687.50.1.el9_8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_8?arch=aarch64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
perf-debuginfo-0:6.12.0-211.58.1.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_2?arch=aarch64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-rt-modules-core-0:6.12.0-55.106.1.el10_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_0?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel-rt-0:6.12.0-55.106.1.el10_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v. 10.0) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_0?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
bpftool-debuginfo-0:7.3.0-427.152.1.el9_4.x86_64 as a component of Red Hat Enterprise Linux Real Time E4S (v.9.4) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_4?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
python3-perf-debuginfo-0:5.14.0-687.50.1.el9_8.x86_64 as a component of Red Hat Enterprise Linux Real Time (v. 9) · fixed
Vendor assessment for this product only.
pkg:rpm/redhat/[email protected]_8?arch=x86_64
- vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Vendor guidance
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
kernel as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-abi-whitelists
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-bootwrapper as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-bootwrapper
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-debug as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-debug
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-debug-devel as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-debug-devel
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-devel as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-devel
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-doc as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-doc
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-firmware as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-firmware
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-headers as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-headers
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-kdump as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-kdump
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel-kdump-devel as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-kdump-devel
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00kernel.src as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel?arch=src
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00perf as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/perf
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00python-perf as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/python-perf
Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
Unverified PoC candidates
Catalogue matches for further research. These repositories have not been validated as working exploits.
2 candidates
- https://github.com/n1k0oowang/CVE-2025-39964_EXP
CVE-2025-39964 EXP
PoC-in-GitHub · CVE-2025-39964
PoC-in-GitHub · CVE-2025-39964 · Updated 2026-09-22T15:16:18Z - https://github.com/suominen/CVE-2025-39964
Tracking CVE-2025-39964, the Linux kernel AF_ALG concurrent-write race
PoC-in-GitHub · CVE-2025-39964
PoC-in-GitHub · CVE-2025-39964 · Updated 2026-09-28T08:36:00Z
Additional exploitation reports
Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.
- VulnCheck KEV · 2026-09-18T00:00:00Z
Source guidance: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Source ransomware assessment: Unknown
VulnCheck KEV · CVE-2025-39964 · Updated 2026-09-18T00:00:00Z - VulnCheck KEV · 2026-09-18T00:00:00ZVulnCheck KEV · CVE-2025-39964
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Linux | Linux Kernel | ≥ 2.6.38 and < 5.10.245 |
| Linux | Linux Kernel | ≥ 5.11 and < 5.15.194 |
| Linux | Linux Kernel | ≥ 5.16 and < 6.1.154 |
| Linux | Linux Kernel | ≥ 6.2 and < 6.6.108 |
| Linux | Linux Kernel | ≥ 6.7 and < 6.12.49 |
| Linux | Linux Kernel | ≥ 6.13 and < 6.16.9 |
| Linux | Linux Kernel | 6.17 |
| Linux | Linux Kernel | 6.17 |
| Linux | Linux Kernel | 6.17 |
| Linux | Linux Kernel | 6.17 |
| Linux | Linux Kernel | 6.17 |
| Linux | Linux Kernel | 6.17 |
| Siemens | Simatic S7 1500 Cpu 1518 4 Pn\/Dp Mfp Firmware | ≥ 3.1.6 |
| Siemens | Simatic S7 1500 Cpu 1518f 4 Pn\/Dp Mfp Firmware | ≥ 3.1.6 |
All CVSS metrics
- HIGH 7.8 v3.1 · CNA Primary
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - HIGH 7.8 v3.1 · NVD Secondary
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - MEDIUM 5.5 v3.1 · NVD Primary
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
Patches & mitigations
- https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9 CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84 CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042 CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 CVE record · Linux · Updated 2026-08-05T12:06:33.126Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160
Advisories
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39964 CVE record · CISA-ADP · Updated 2026-09-19T03:56:17.769Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://cert-portal.siemens.com/productcert/html/ssa-019113.html CVE record · siemens-SADP · Updated 2026-10-15T01:08:42.257Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://cert-portal.siemens.com/productcert/html/ssa-457936.html CVE record · siemens-SADP · Updated 2026-10-15T01:08:42.257Z
NVD · CVE-2025-39964 · Updated 2026-10-19T21:10:00.160 - https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39964.json Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-34068 EUVD · EUVD-2025-34068
- https://vulncheck.com/kev VulnCheck KEV · CVE-2025-39964 · Updated 2026-09-18T00:00:00Z
Technical & other
- https://access.redhat.com/security/cve/CVE-2025-39964 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://bugzilla.redhat.com/show_bug.cgi?id=2403545 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://www.cve.org/CVERecord?id=CVE-2025-39964 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://nvd.nist.gov/vuln/detail/CVE-2025-39964 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://lore.kernel.org/linux-cve-announce/2025101334-CVE-2025-39964-7964@gregkh/T Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:72059 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71687 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71326 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71601 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71327 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:70498 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:70402 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71592 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71594 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:70459 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71569 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:73788 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71657 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71565 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:70403 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://access.redhat.com/errata/RHSA-2026:71606 Red Hat · CVE-2025-39964 · Updated 2026-10-14T17:49:16+00:00
- https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json VulnCheck KEV · CVE-2025-39964 · Updated 2026-09-18T00:00:00Z
Sources: NVD · CVE.org · All sources and attribution · EPSS