SB20260507119 - Improper locking in Linux kernel clocksource driver
Published: May 7, 2026
Security Bulletin ID
SB20260507119
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-2026-43227)
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 cause a denial of service.
The vulnerability exists due to improper lock handling in the sh_tmu clocksource driver when managing power state and clocks during clockevent operations. A local user can trigger clockevent activity to cause a denial of service.
This issue is relevant on PREEMPT_RT builds, where normal spinlocks can sleep and the lock context mismatch may become problematic.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/016476afef993d1201a19decc9b5b2ea1e6620f2
- https://git.kernel.org/stable/c/0e513cc6b9cea190fe342cc222b1054e7e8acfc8
- https://git.kernel.org/stable/c/6f113ab549b864c1bc57d4f89846ee335394089a
- https://git.kernel.org/stable/c/79d650695773f03de36b99228a090d33d1c18264
- https://git.kernel.org/stable/c/88c76792180dffd83f1c5b9dc8fdaeb145cb94e0
- https://git.kernel.org/stable/c/b1278972b08e480990e2789bdc6a7c918bc349be
- https://git.kernel.org/stable/c/bc59d5f3afe41fec5d673c27c703b761ae578d28
- https://git.kernel.org/stable/c/f0b31247e7d67a943b3a09d3cef7c0ae788d88e6