CVE-2026-80757: Linux kernel · selinux: reject a class permission count below its inherited common
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Sep 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that rejects SELinux classes whose permission count is below their inherited common's permission count. Users should apply the updated Linux kernel versions that include this fix. Since this is a kernel-level issue, updating to a patched kernel version is the recommended remediation.
Description
A vulnerability in the Linux kernel SELinux subsystem allows an out-of-bounds heap write due to improper validation of class permission counts relative to inherited common permissions. Specifically, a class that inherits a common with more permissions than the class declares can cause memory corruption when the policy is loaded. Well-formed policies that correctly include inherited permissions are not affected. This issue has been resolved by rejecting classes whose permission count is below their inherited common's count.
References
- ubuntu.com/security/CVE-2026-80757 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80757 (opens in a new tab)
- git.kernel.org/linus/9a82dcd98b6e6e11cfd162410967951f12152528 (opens in a new tab)
- git.kernel.org/stable/c/1b995966c3ae5244751bdaee9bfe7e17567d4fbe (opens in a new tab)
- git.kernel.org/stable/c/2002ff745db64ac83ee1bb9ff78196d2d68bfdb3 (opens in a new tab)
- git.kernel.org/stable/c/2b7ffd7921fcbfe408fb7b372e47454e45b1e6a7 (opens in a new tab)
- git.kernel.org/stable/c/38d91446630a20ce8c2a981810deea81fd61a3b5 (opens in a new tab)
- git.kernel.org/stable/c/638213f2e6ea52c06a25861616781338d154db35 (opens in a new tab)
- git.kernel.org/stable/c/9a82dcd98b6e6e11cfd162410967951f12152528 (opens in a new tab)
- git.kernel.org/stable/c/a63011c009ea79439b800a05602b880eb4adbb05 (opens in a new tab)
- git.kernel.org/stable/c/acd5b09be98fd38b7392307880156fb0452a7276 (opens in a new tab)