Uninitialized SELinux access decision in Linux kernel AVC
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 6 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel's SELinux access decision function avc_has_perm_noaudit() returns without filling in the access decision when the requested permission set is empty. Its callers pass an uninitialized stack variable and then use it for auditing and, in the inode hook, for caching, so they act on undefined data.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: selinux: always fill AVC decision in avc_has_perm_noaudit() avc_has_perm_noaudit() is documented to return a copy of the access decision in @avd, but its early return for an empty requested permission set leaves the buffer untouched. All callers pass an uninitialized stack variable and afterwards feed it to avc_audit(), and the inode hook even stores it in the per-task decision cache. Fill in a deny-all, audit-all decision, similar to avd_init(), so every caller receives a defined value at no cost on the hot path.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
Update the Linux kernel to 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8, or 7.3, or to a later release that contains the fixing commit. The sources list no fixed version for Red Hat Enterprise Linux 8, 9 and 10 or for Red Hat OpenShift Container Platform 4 and 5, and no fix planned for Red Hat Enterprise Linux 6.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA Linux (Linux) Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-14 Threatist record created from CVE-2026-98413
- 2026-10-14 Alias added: GHSA-m3f9-pmfc-6c92
- 2026-10-16 Affected versions changed · Red Hat
- 2026-10-16 CVSS score added · Red Hat
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/c781e737aa0de95289b1774d5fd29388895737a9
- https://git.kernel.org/stable/c/e308c5acfe283a66627fc407065626df4ab753ec
- https://git.kernel.org/stable/c/f9da796fa238f8e4414ee8481e6c979759a3d563
- https://git.kernel.org/stable/c/e77461af13eab5c9a953cc52ec8432cc941d61e2
- https://git.kernel.org/stable/c/5a6f9a872b4ff68877caf998bee352153b7154bc
- https://git.kernel.org/stable/c/24e00850bcff46b984f4c44b92e5499450fcfb5a
- https://git.kernel.org/stable/c/835133337c2ce200db56f62d018c79087dee2603
- https://git.kernel.org/stable/c/8861db305103107199b1426f25fde1fb6d465583
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Sources
- CVE-2026-98413 · CVE Program
- CVE-2026-98413 · NVD
- FIRST EPSS
- GHSA-m3f9-pmfc-6c92 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98413 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences