SB20260812366 - Improper locking in Linux kernel misc driver
Published: August 12, 2026
Security Bulletin ID
SB20260812366
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-2026-68179)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock handling in nsm_dev_ioctl() in drivers/misc/nsm.c when processing an ioctl request with an invalid user pointer during copy_from_user(). A local user can send a crafted ioctl request to cause a denial of service.
The issue is triggered on the pre-lock error path before the mutex is acquired.
Remediation
Install update from vendor's website.