CVE-2022-49425 f2fs: fix dereference of stale list iterator after loop body
A stale list iterator dereference in the Linux kernel f2fs module can lead to out-of-bounds reads and potential system crashes.
- 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-2022-49425?
CVE-2022-49425 is a high-severity vulnerability in Linux kernel, published on 26 Feb 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:
f2fs: fix dereference of stale list iterator after loop body
The list iterator variable will be a bogus pointer if no break was hit. Dereferencing it (cur->page in this case) could load an out-of-bounds/undefined value making it unsafe to use that in the comparision to determine if the specific element was found.
Since 'cur->page' *can* be out-ouf-bounds it cannot be guaranteed that by chance (or intention of an attacker) it matches the value of 'page' even though the correct element was not found.
This is fixed by using a separate list iterator variable for the loop and only setting the original variable if a suitable element was found. Then determing if the element was found is simply checking if the variable is set.
Weakness: CWE-476
Which versions are affected by CVE-2022-49425?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49425?
Apply the vendor's patch.
Is CVE-2022-49425 being exploited?
There is no known exploitation of CVE-2022-49425 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49425, GHSA-2j82-ggvf-vjmx, UBUNTU-CVE-2022-49425.