CVE-2026-45893 apparmor: Fix & Optimize table creation from possibly unaligned memory
A flaw in the Linux kernel's AppArmor module allows unaligned memory access from userspace, potentially leading to system crashes or arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45893?
CVE-2026-45893 is a high-severity memory corruption vulnerability in Linux kernel, published on 27 May 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:
apparmor: Fix & Optimize table creation from possibly unaligned memory
Source blob may come from userspace and might be unaligned. Try to optize the copying process by avoiding unaligned memory accesses.
- Added Fixes tag - Added "Fix &" to description as this doesn't just optimize but fixes a potential unaligned memory access [jj: remove duplicate word "convert" in comment trigger checkpatch warning]
Weakness: CWE-125
Which versions are affected by CVE-2026-45893?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45893?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-45893 being exploited?
There is no known exploitation of CVE-2026-45893 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88767, BELL-CVE-2026-45893, DEBIAN-CVE-2026-45893, GHSA-44ww-rw32-794r, ROOT-OS-DEBIAN-11-CVE-2026-45893, ROOT-OS-DEBIAN-12-CVE-2026-45893 and 3 more.