CVE-2026-80757

Description

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.

References

• https://git.kernel.org/stable/c/1b995966c3ae5244751bdaee9bfe7e17567d4fbe
• https://git.kernel.org/stable/c/2002ff745db64ac83ee1bb9ff78196d2d68bfdb3
• https://git.kernel.org/stable/c/2b7ffd7921fcbfe408fb7b372e47454e45b1e6a7
• https://git.kernel.org/stable/c/38d91446630a20ce8c2a981810deea81fd61a3b5
• https://git.kernel.org/stable/c/638213f2e6ea52c06a25861616781338d154db35