CVE-2026-98961 btrfs: unlock inode and extent in caller when io_uring read extent fails
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-98961?
CVE-2026-98961 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: unlock inode and extent in caller when io_uring read extent fails
btrfs_uring_read_extent() runs only after btrfs_encoded_read() has taken the inode shared lock and the extent lock. On failure it used to unlock in out_fail, and a pages-array allocation failure returned -ENOMEM without unlocking at all.
Unlock in the caller instead on all failure returns, matching the copy_to_user() error path. The deferred -EIOCBQUEUED path still unlocks in btrfs_uring_read_finished().
Which versions are affected by CVE-2026-98961?
How do I fix CVE-2026-98961?
Upgrade to a fixed version.
Is CVE-2026-98961 being exploited?
There is no known exploitation of CVE-2026-98961 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98961, DEBIAN-CVE-2026-98961, GHSA-3xcr-f59c-pjvq, UBUNTU-CVE-2026-98961.