SB20260824245 - Deadlock in Linux kernel sched
Published: August 24, 2026
Security Bulletin ID
SB20260824245
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) Deadlock (CVE-ID: CVE-2026-74593)
CWE-ID: CWE-833 - Deadlock
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 ordering in scx_cgroup_lock() when handling concurrent sched_ext enable or disable operations, cgroup removal, and cpu.weight writes. A local user can trigger a deadlock to cause a denial of service.
The issue arises through an interaction with kernfs during cgroup teardown and cpu controller file activity.
Remediation
Install update from vendor's website.