SB2026091914 - Improper locking in Linux kernel clocksource
Published: September 19, 2026
Security Bulletin ID
SB2026091914
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-2026-90208)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 locking in the Samsung PWM timer driver when handling timer operations in hard interrupt context. A local user can trigger Samsung PWM timer operations to cause a denial of service.
The issue is limited to ARM systems with PREEMPT_RT enabled where the Samsung PWM timer is used as a clock source.
Remediation
Install update from vendor's website.