VulnerabilityPublished 3 Sep 2026Updated 6 Nov 2026

CVE-2026-80757: Linux kernel · selinux: reject a class permission count below its inherited common

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in acd5b09be98fd38b7392307880156fb0452a7276 : patch Linux kernel soon.

Data as of 6 Nov 2026, 17:40 UTC

Severity

High

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

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in acd5b09be98fd38b7392307880156fb0452a7276, a63011c009ea79439b800a05602b880eb4adbb05, 638213f2e6ea52c06a25861616781338d154db35 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < acd5b09be98fd38b7392307880156fb0452a7276	Fixed in acd5b09be98fd38b7392307880156fb0452a7276
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < a63011c009ea79439b800a05602b880eb4adbb05	Fixed in a63011c009ea79439b800a05602b880eb4adbb05
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 638213f2e6ea52c06a25861616781338d154db35	Fixed in 638213f2e6ea52c06a25861616781338d154db35
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 2002ff745db64ac83ee1bb9ff78196d2d68bfdb3	Fixed in 2002ff745db64ac83ee1bb9ff78196d2d68bfdb3
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 38d91446630a20ce8c2a981810deea81fd61a3b5	Fixed in 38d91446630a20ce8c2a981810deea81fd61a3b5
LinuxLinux	Affected ≥ 55fcf09b3fe4325c9395ebbb0322a547a157ebc7, < 9a82dcd98b6e6e11cfd162410967951f12152528	Fixed in 9a82dcd98b6e6e11cfd162410967951f12152528

AI-suggested

A fix is available and has been applied in multiple Linux kernel commits. Users should update to a Linux kernel version including these fixes to prevent exploitation. Since well-formed policies are unaffected, ensuring SELinux policies are correctly formed also mitigates the risk.

Description

A vulnerability in the Linux kernel SELinux subsystem allows a class permission count smaller than its inherited common permissions, leading to an out-of-bounds heap write during policy loading. Well-formed policies that correctly include inherited permissions are not affected. The issue has been fixed in several Linux kernel commits.

Impact

This vulnerability results in an out-of-bounds heap write in the SELinux policy loading process, which could potentially lead to memory corruption. However, no known exploits in the wild have been reported. The impact is limited to malformed SELinux policies that declare fewer permissions than their inherited common permissions.

Summary

CVE-2026-80757 addresses a flaw in the Linux kernel's SELinux implementation where security_get_permissions() maps inherited common permissions into an array sized by the class's own permission count (nprim). However, class_read() uses the class's nprim from the policy image without verifying it covers the inherited common permissions. If a class inherits a common with more permissions than its declared nprim, this leads to an out-of-bounds heap write when the common's permissions are written past the class-sized array. The fix rejects classes whose permission count is below that of their inherited common, preventing the heap overflow. Well-formed policies that already include inherited permissions in their class count are unaffected.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 17:40 UTC

Technical details

References

Community reviews

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