CVE-2022-49168 btrfs: do not clean up repair bio if submit fails
A use-after-free vulnerability in the Linux kernel's btrfs filesystem allows attackers to cause denial of service or potentially execute code via race conditions.
- 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-2022-49168?
CVE-2022-49168 is a high-severity use after free 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:
btrfs: do not clean up repair bio if submit fails
The submit helper will always run bio_endio() on the bio if it fails to submit, so cleaning up the bio just leads to a variety of use-after-free and NULL pointer dereference bugs because we race with the endio function that is cleaning up the bio. Instead just return BLK_STS_OK as the repair function has to continue to process the rest of the pages, and the endio for the repair bio will do the appropriate cleanup for the page that it was given.
Weakness: CWE-416
Which versions are affected by CVE-2022-49168?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49168?
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-2022-49168 being exploited?
There is no known exploitation of CVE-2022-49168 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-59135, DEBIAN-CVE-2022-49168, GHSA-54fp-2qhf-47h6, ROOT-OS-DEBIAN-11-CVE-2022-49168, ROOT-OS-UBUNTU-2204-CVE-2022-49168, UBUNTU-CVE-2022-49168.