CVE-2022-49167 btrfs: do not double complete bio on errors during compressed reads
A double completion of a bio in the Linux kernel btrfs compressed read path can cause system panics, leading to denial of service.
- 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-2022-49167?
CVE-2022-49167 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:
btrfs: do not double complete bio on errors during compressed reads
I hit some weird panics while fixing up the error handling from btrfs_lookup_bio_sums(). Turns out the compression path will complete the bio we use if we set up any of the compression bios and then return an error, and then btrfs_submit_data_bio() will also call bio_endio() on the bio.
Fix this by making btrfs_submit_compressed_read() responsible for calling bio_endio() on the bio if there are any errors. Currently it was only doing it if we created the compression bios, otherwise it was depending on btrfs_submit_data_bio() to do the right thing. This creates the above problem, so fix up btrfs_submit_compressed_read() to always call bio_endio() in case of an error, and then simply return from btrfs_submit_data_bio() if we had to call btrfs_submit_compressed_read().
Which versions are affected by CVE-2022-49167?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49167?
Apply the vendor's patch.
Is CVE-2022-49167 being exploited?
There is no known exploitation of CVE-2022-49167 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49167, GHSA-vr74-h7w6-qjp6, ROOT-OS-DEBIAN-11-CVE-2022-49167, ROOT-OS-UBUNTU-2204-CVE-2022-49167, UBUNTU-CVE-2022-49167.