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CVE-2026-64406

HIGH 8 ALL-YEARS

Published 2026-07-25 · Last modified 2026-10-19 · Linux · NVD: Modified

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

ELEVATED IMPACT

Severe if exploited (CVSS 8), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 20th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

8CVSS 3.1 · HIGH · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Must sit on the same / adjacent network
  • ⚠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

Vendors Linux

Products Linux Linux Kernel

Weakness (CWE)

  • CWE-416: Use After Free

CVSS vector

CVSS:3.1/AV:A/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 275 vendor product statements; 243 omitted. Read the full vendor advisory.

  • kernel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-64k-debug-devel-matched as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-64k-debug-devel-matched

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-64k-modules as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-64k-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-debug-core as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug-core

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-debug-uki-virt as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug-uki-virt

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-modules-extra as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-modules-extra

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-64k-debug as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-64k-debug

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-64k-devel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-64k-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-debug-core as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-debug-core

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-devel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-tools-libs as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-tools-libs

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-zfcpdump-devel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-zfcpdump-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • libperf as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/libperf

    • none available: Fix deferred
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-abi-whitelists

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-firmware as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-firmware

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • python-perf as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-perf

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • bpftool as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bpftool

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-debug as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-tools-libs-devel as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-tools-libs-devel

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-debug-modules as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-debug-modules

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-debug as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-selftests-internal as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-selftests-internal

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel.src as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel?arch=src

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-64k-debug-modules-core as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-64k-debug-modules-core

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-cross-headers as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-cross-headers

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-devel as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-devel

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-64k-core as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-64k-core

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-64k-devel-matched as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-64k-devel-matched

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug-kvm

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-rt-modules-partner as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-modules-partner

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • kernel-zfcpdump-devel-matched as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-zfcpdump-devel-matched

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00
  • rv as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/rv

    Red Hat · CVE-2026-64406 · Updated 2026-10-12T16:37:05+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxLinux Kernel≥ 5.10.259 and < 5.10.261
LinuxLinux Kernel≥ 5.15.210 and < 5.15.212
LinuxLinux Kernel≥ 6.1.175 and < 6.1.178
LinuxLinux Kernel≥ 6.6.142 and < 6.6.145
LinuxLinux Kernel≥ 6.12.92 and < 6.12.96
LinuxLinux Kernel≥ 6.18.34 and < 6.18.39
LinuxLinux Kernel≥ 7.0.11 and < 7.1
LinuxLinux Kernel≥ 7.1.1 and < 7.1.4
LinuxLinux Kernel7.1
LinuxLinux Kernel7.1
LinuxLinux Kernel7.1
LinuxLinux Kernel7.1
LinuxLinux Kernel7.2
LinuxLinux Kernel7.2

All CVSS metrics

  • HIGH 8 v3.1 · CNA Primary
    CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • HIGH 8 v3.1 · NVD Secondary
    CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS