CVE-2022-50754 apparmor: fix a memleak in multi_transaction_new()
A memory leak in the Linux kernel AppArmor module allows local attackers to cause a denial of service by exhausting system memory.
- 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-2022-50754?
CVE-2022-50754 is a memory corruption vulnerability in Linux, published on 24 Dec 2025. 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 a memleak in multi_transaction_new()
In multi_transaction_new(), the variable t is not freed or passed out on the failure of copy_from_user(t->data, buf, size), which could lead to a memleak.
Fix this bug by adding a put_multi_transaction(t) in the error path.
Which versions are affected by CVE-2022-50754?
How do I fix CVE-2022-50754?
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-2022-50754 being exploited?
There is no known exploitation of CVE-2022-50754 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50754, GHSA-fx2h-pcqr-7fq9, UBUNTU-CVE-2022-50754.