CVE-2022-50746 erofs: validate the extent length for uncompressed pclusters
A use-after-free vulnerability in the Linux kernel's EROFS filesystem allows attackers to cause denial of service or potentially execute code via a crafted image.
- 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-2022-50746?
CVE-2022-50746 is a high-severity use after free 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:
erofs: validate the extent length for uncompressed pclusters
syzkaller reported a KASAN use-after-free: https://syzkaller.appspot.com/bug?extid=2ae90e873e97f1faf6f2
The referenced fuzzed image actually has two issues: - m_pa == 0 as a non-inlined pcluster; - The logical length is longer than its physical length.
The first issue has already been addressed. This patch addresses the second issue by checking the extent length validity.
Which versions are affected by CVE-2022-50746?
How do I fix CVE-2022-50746?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-50746 being exploited?
There is no known exploitation of CVE-2022-50746 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50746, GHSA-9rf3-hx86-5f4p, ROOT-OS-DEBIAN-11-CVE-2022-50746, ROOT-OS-UBUNTU-2204-CVE-2022-50746, UBUNTU-CVE-2022-50746.