VulnerabilityPublished 14 Oct 2026Updated 19 Oct 2026

CVE-2026-98413: Linux kernel · selinux: always fill AVC decision in avc_has_perm_noaudit()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f9da796fa238f8e4414ee8481e6c979759a3d563 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f9da796fa238f8e4414ee8481e6c979759a3d563, e77461af13eab5c9a953cc52ec8432cc941d61e2, e308c5acfe283a66627fc407065626df4ab753ec +5

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ e6f2f381e4015386a656a369835f949c26000e6b, < f9da796fa238f8e4414ee8481e6c979759a3d563	Fixed in f9da796fa238f8e4414ee8481e6c979759a3d563
LinuxLinux	Affected ≥ e6f2f381e4015386a656a369835f949c26000e6b, < e77461af13eab5c9a953cc52ec8432cc941d61e2	Fixed in e77461af13eab5c9a953cc52ec8432cc941d61e2
LinuxLinux	Affected ≥ e6f2f381e4015386a656a369835f949c26000e6b, < e308c5acfe283a66627fc407065626df4ab753ec	Fixed in e308c5acfe283a66627fc407065626df4ab753ec
LinuxLinux	Affected ≥ e6f2f381e4015386a656a369835f949c26000e6b, < c781e737aa0de95289b1774d5fd29388895737a9	Fixed in c781e737aa0de95289b1774d5fd29388895737a9
LinuxLinux	Affected ≥ e6f2f381e4015386a656a369835f949c26000e6b, < 835133337c2ce200db56f62d018c79087dee2603	Fixed in 835133337c2ce200db56f62d018c79087dee2603
LinuxLinux	Affected ≥ e6f2f381e4015386a656a369835f949c26000e6b, < 8861db305103107199b1426f25fde1fb6d465583	Fixed in 8861db305103107199b1426f25fde1fb6d465583

AI-suggested

A fix has been implemented and is available in the Linux kernel commits identified by the provided fixedVersions hashes. Users should update to a Linux kernel version that includes these fixes to ensure the vulnerability is resolved.

Description

A vulnerability in the Linux kernel SELinux component was fixed where the avc_has_perm_noaudit() function did not properly initialize the AVC decision structure when the requested permission set was empty. This could lead to uninitialized data being used in access control auditing and caching.

Impact

The vulnerability could cause uninitialized memory to be used in SELinux access control decisions and auditing, potentially leading to incorrect audit records or caching of invalid decisions. There is no indication of direct privilege escalation or code execution impact. No known exploits in the wild have been reported.

Summary

The Linux kernel SELinux module's avc_has_perm_noaudit() function is documented to return a copy of the access decision in the provided avd parameter. However, if the requested permission set is empty, the function returns early without initializing the avd buffer. Since all callers pass an uninitialized stack variable and then use it in avc_audit() or store it in the per-task decision cache, this could result in undefined behavior. The fix ensures that a deny-all, audit-all decision is filled in, providing a defined value to all callers without impacting performance on the common execution path.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:20 UTC

Technical details

References

Community reviews

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