SB20260508144 - Improper locking in Linux kernel sched
Published: May 8, 2026
Security Bulletin ID
SB20260508144
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-2026-43392)
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 scheduling logic in scx_enable() when switching the calling thread from fair to ext class under fair-class saturation. A local user can trigger scx_enable() while the system is saturated with fair-class workloads to cause a denial of service.
The issue can indefinitely starve the enable thread and hang the system.
Remediation
Install update from vendor's website.