CVE-2026-80755 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506245
- published5 Oct 2026
- disclosed3 Sept 2026
Introduced: 3 Sep 2026
CVE-2026-80755 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
selinux: reject a permission value exceeding the class permission count
perm_read() bounds a permission value by SEL_VEC_MAX but never by the nprim of the owning class or common, which is taken verbatim from the policy image. security_get_permissions() then writes perms[value - 1] into an nprim-sized kcalloc() array, so a class declaring fewer permissions than its largest permission value drives an out-of-bounds heap write. The top-level symbol tables are validated this way; the nested per-class permission table is not.
Reject a permission whose value exceeds nprim, which is already set when perm_read() runs. Well-formed policies are unaffected.
[PM: tweak comment for line length]
References
- https://security-tracker.debian.org/tracker/CVE-2026-80755
- https://git.kernel.org/stable/c/6c2ab7c4549f4f2305848df834e784651dbf1676
- https://git.kernel.org/stable/c/a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e
- https://git.kernel.org/stable/c/d14b5d0e97fccd27974fedc03b903408872907fd
- https://git.kernel.org/stable/c/dfc59a062c386d3d4415ecdab781065a645f33cc