Deadlock in Linux kernel - CVE-2026-53122
Published: June 25, 2026
Vulnerability identifier: #VU135186
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-53122
CWE-ID: CWE-833
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-53122
Install security update from vendor's repository.