SB20260925150 - Deadlock in Linux kernel sched ext
Published: September 25, 2026
Security Bulletin ID
SB20260925150
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-2026-93220)
CWE-ID: CWE-833 - Deadlock
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 synchronization in the sched_ext kick_sync_wait_bal_cb() callback when the callback is executed on a foreign CPU. A local user can trigger scheduler operations that flush pending balance callbacks to cause a deadlock.
Remediation
Install update from vendor's website.