SB20260105109 - Improper locking in Linux kernel block
Published: January 5, 2026
Security Bulletin ID
SB20260105109
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2025-68756)
CWE-ID: CWE-667 - Improper Locking
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 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.
Remediation
Install update from vendor's website.