What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-10-30

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]

Affected products

• Linux: 2.6.23 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

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

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