Improper locking in Linux kernel - CVE-2025-68756
Published: January 5, 2026
Vulnerability identifier: #VU120960
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-2025-68756
CWE-ID: CWE-667
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 perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the blk_mq_quiesce_tagset(), blk_mq_unquiesce_tagset(), blk_mq_del_queue_tag_set() and blk_mq_add_queue_tag_set() functions in block/blk-mq.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2025-68756
Install update from vendor's repository.