CVE-2026-80757

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < 2002ff745db64ac83ee1bb9ff78196d2d68bfdb3affected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < 38d91446630a20ce8c2a981810deea81fd61a3b5affected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < 638213f2e6ea52c06a25861616781338d154db35affected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < 2b7ffd7921fcbfe408fb7b372e47454e45b1e6a7affected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < a63011c009ea79439b800a05602b880eb4adbb05affected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < acd5b09be98fd38b7392307880156fb0452a7276affected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < 1b995966c3ae5244751bdaee9bfe7e17567d4fbeaffected
LinuxLinux55fcf09b3fe4325c9395ebbb0322a547a157ebc7 < 9a82dcd98b6e6e11cfd162410967951f12152528affected
LinuxLinux2.6.23affected
LinuxLinux0 < 2.6.23unaffected
LinuxLinux5.10.266 <= 5.10.*unaffected
LinuxLinux5.15.217 <= 5.15.*unaffected
LinuxLinux6.1.184 <= 6.1.*unaffected
LinuxLinux6.6.153 <= 6.6.*unaffected
LinuxLinux6.12.105 <= 6.12.*unaffected
LinuxLinux6.18.46 <= 6.18.*unaffected
LinuxLinux7.1.10 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References