Out-of-bounds write in Linux kernel - CVE-2026-80755

Vulnerability details

The vulnerability allows a local user to perform an out-of-bounds heap write.

The vulnerability exists due to an out-of-bounds write in the SELinux policy permission parser when processing a policy image in which a class declares fewer permissions than its largest permission value. A local user can supply a crafted policy containing such a permission declaration to perform an out-of-bounds heap write.

Affected software

How to mitigate CVE-2026-80755

External References

• https://git.kernel.org/stable/c/6c2ab7c4549f4f2305848df834e784651dbf1676
• https://git.kernel.org/stable/c/a7f3d4f22d920dc3c7d75f02ece0f7bf2c58437e
• https://git.kernel.org/stable/c/d14b5d0e97fccd27974fedc03b903408872907fd
• https://git.kernel.org/stable/c/dfc59a062c386d3d4415ecdab781065a645f33cc

Related Security Bulletins

• Out-of-bounds write in Linux kernel selinux ss