CVE-2026-80757

In the Linux kernel, the following vulnerability has been resolved:

selinux: reject a class permission count below its inherited common

security get permissions() maps an inherited common's permissions into an array sized by the class's own permissions.nprim, but class read() takes that nprim verbatim from the policy image and never checks that it covers the common. A class that inherits a common of N permissions while declaring a smaller nprim is accepted, and on load the common's permissions are written past the class-sized array -- an out-of-bounds heap write.

Reject a class whose permission count is below its inherited common's. Well-formed policies, where the class count already includes the inherited permissions, are unaffected.