CVE-2026-98413 selinux: always fill AVC decision in avc_has_perm_noaudit()
A flaw in the Linux kernel SELinux module allows uninitialized memory disclosure via AVC decisions, potentially leaking sensitive kernel data to local attackers.
- 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-2026-98413?
CVE-2026-98413 is a vulnerability in Linux, published on 14 Oct 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: always fill AVC decision in avc_has_perm_noaudit()
avc_has_perm_noaudit() is documented to return a copy of the access decision in @avd, but its early return for an empty requested permission set leaves the buffer untouched. All callers pass an uninitialized stack variable and afterwards feed it to avc_audit(), and the inode hook even stores it in the per-task decision cache.
Fill in a deny-all, audit-all decision, similar to avd_init(), so every caller receives a defined value at no cost on the hot path.
Which versions are affected by CVE-2026-98413?
How do I fix CVE-2026-98413?
Apply the vendor's patch.
Is CVE-2026-98413 being exploited?
There is no known exploitation of CVE-2026-98413 in the wild and no public exploit code.
Sources
Also known as AZL-108185, BELL-CVE-2026-98413, DEBIAN-CVE-2026-98413, GHSA-m3f9-pmfc-6c92, UBUNTU-CVE-2026-98413.