SB2026062535 - Deadlock in Linux kernel btrfs

Description

This security bulletin contains information about 1 vulnerability.

1) Deadlock (CVE-ID: CVE-2026-53122)

CWE-ID: CWE-833 - Deadlock

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a deadlock condition in the btrfs reflink operation when processing reflink operations with the flushoncommit mount option enabled. A local user can trigger a reflink of an inline extent to an offset beyond the destination inode size to cause a denial of service.

Exploitation requires the flushoncommit mount option and a reflink operation that copies an inline extent beyond the current i_size of the destination inode.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6f0f9c0a368aa1fe078109091322d3b0632d9380
• https://git.kernel.org/stable/c/73be4a08306bb84f4d5d16f62cb80e1543109ffa
• https://git.kernel.org/stable/c/9a24f0000876b8755cf21972b41632f4d6f3dafb
• https://git.kernel.org/stable/c/b48c980b6a7e409050bb3067165db31cc6205e3e