Improper locking in Linux kernel - CVE-2026-90208
Published: September 19, 2026
Vulnerability identifier: #VU151282
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90208
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90208
Install security update from vendor's repository.