CVE-2026-100073
MEDIUM 5.5In the Linux kernel, the following vulnerability has been resolved: ext4: fix transaction overflow during writeback Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent conversion") was correct to note that we need to reserve enough credits for all extents possibly underlying a large folio. However it was too eager to reduce the number of reserved credits. Extent conversion may not only need to touch several leaf extent blocks, it may also need to split extents - for example a single large unwritten extent may need to be split into many small written ones in case of sparse folio dirtying. This can thus result not only in extent leaf modifications but also in a need to allocate new extent tree nodes. As a result the reserved transaction credits were not sufficient in some corner cases. Use ext4_meta_trans_blocks() for correct upper bound credit estimate.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 1st percentile
Impact if exploited
5.5CVSS 3.1 · MEDIUM
- ConfidentialityNone
- IntegrityNone
- 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.
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Data snapshot:
Weakness (CWE)
- CWE-617: Reachable Assertion
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References and research data (JSON)
Vendor product assessments
Showing 32 of 278 vendor product statements; 246 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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
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
- 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.
- none available: Fix deferred
libperf as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/libperf
- 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.
- none available: Fix deferred
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
- 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.
- no fix planned: Out of support scope
kernel-firmware as a component of Red Hat Enterprise Linux 6 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-firmware
- 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.
- no fix planned: Out of support scope
python-perf as a component of Red Hat Enterprise Linux 6 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/python-perf
- 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.
- no fix planned: Out of support scope
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-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-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-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel.src 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?arch=src
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-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-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-rt-debug-core 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-core
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-rt.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-rt?arch=src
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00perf 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/perf
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-64k-debug-modules-internal 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-internal
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-debug 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-debug
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-doc 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-doc
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-rt-64k-debug 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-debug
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-rt-64k-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-64k-kvm
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-rt-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-rt-debug-modules-core
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-rt-selftests-internal 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-selftests-internal
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00kernel-zfcpdump-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-zfcpdump-modules-core
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:oci/ose-rhel-coreos-9?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9
Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Linux | Linux Kernel | ≥ 6.16.3 and < 6.17 |
| Linux | Linux Kernel | ≥ 6.17 and < 7.2.6 |
References
Patches & mitigations
- https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8 CVE record · Linux · Updated 2026-10-19T08:43:05.446Z
NVD · CVE-2026-100073 · Updated 2026-10-21T18:57:22.487 - https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1 CVE record · Linux · Updated 2026-10-19T08:43:05.446Z
NVD · CVE-2026-100073 · Updated 2026-10-21T18:57:22.487
Advisories
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100073.json Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87053 EUVD · EUVD-2026-87053
Technical & other
- https://access.redhat.com/security/cve/CVE-2026-100073 Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00
- https://bugzilla.redhat.com/show_bug.cgi?id=2541430 Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-100073 Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00
- https://nvd.nist.gov/vuln/detail/CVE-2026-100073 Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00
- https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-100073.mbox Red Hat · CVE-2026-100073 · Updated 2026-10-21T20:12:46+00:00