CVE-2026-80912 selinux: reject an unclaimed class value in security_get_classes()
A null pointer dereference in the Linux kernel SELinux subsystem allows local attackers to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80912?
CVE-2026-80912 is a vulnerability in Linux, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
selinux: reject an unclaimed class value in security_get_classes()
security_get_classes() sizes an array by p_classes.nprim and fills it at value - 1, so a class value the policy never defines leaves a NULL. sel_make_classes() passes every entry to sel_make_dir(), reaching the same d_alloc_name() dereference as the permission array. The class symbol table is allowed to be sparse (policydb_class_isvalid() exists to absorb that), but this getter builds its own array straight from the hash table and has no such predicate.
Fail the lookup when a value went unclaimed instead of handing out the NULL. Conforming policies define every class they declare and are unaffected.
Which versions are affected by CVE-2026-80912?
How do I fix CVE-2026-80912?
Apply the vendor's patch.
Is CVE-2026-80912 being exploited?
There is no known exploitation of CVE-2026-80912 in the wild and no public exploit code.
Sources
Also known as AZL-99443, BELL-CVE-2026-80912, DEBIAN-CVE-2026-80912, GHSA-5v22-vqg5-vrr8, UBUNTU-CVE-2026-80912.