Use of Uninitialized Variable in Linux kernel - CVE-2026-98413

Vulnerability details

The vulnerability allows a local user to cause SELinux to use uninitialized access-decision data.

The vulnerability exists due to use of an uninitialized stack variable in the SELinux avc_has_perm_noaudit() function when handling an empty requested permission set. A local user can trigger a permission check with an empty requested permission set to cause SELinux to use uninitialized access-decision data.

Callers pass the resulting decision to avc_audit(), and the inode hook also stores it in the per-task decision cache.

Affected software

How to mitigate CVE-2026-98413

External References

• https://git.kernel.org/stable/c/24e00850bcff46b984f4c44b92e5499450fcfb5a
• https://git.kernel.org/stable/c/5a6f9a872b4ff68877caf998bee352153b7154bc
• https://git.kernel.org/stable/c/835133337c2ce200db56f62d018c79087dee2603
• https://git.kernel.org/stable/c/8861db305103107199b1426f25fde1fb6d465583
• https://git.kernel.org/stable/c/c781e737aa0de95289b1774d5fd29388895737a9
• https://git.kernel.org/stable/c/e308c5acfe283a66627fc407065626df4ab753ec
• https://git.kernel.org/stable/c/e77461af13eab5c9a953cc52ec8432cc941d61e2
• https://git.kernel.org/stable/c/f9da796fa238f8e4414ee8481e6c979759a3d563

Related Security Bulletins

• Use of Uninitialized Variable in Linux kernel selinux
• Debian update for linux