CVE-2026-80755
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, in the SELinux module, there is a vulnerability due to not rejecting a permission value exceeding the class permission count. perm_read() bounds the value by SEL_VEC_MAX but not by nprim of the class, leading to an out-of-bounds heap write in security_get_permissions(). The fix rejects permissions whose value exceeds nprim.
Risk Assessment
The vulnerability could lead to out-of-bounds heap write, potentially causing system crash or privilege escalation. It could be exploited to gain control over a system with SELinux policy.
Recommendation
Apply a Linux kernel update containing the fix that rejects permissions exceeding the class permission count.
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Original NVD description (English source)
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]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS