SB20260912192 - Deadlock in Linux kernel cxl driver
Published: September 12, 2026
Security Bulletin ID
SB20260912192
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-2026-89589)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to improper locking in the CXL CPER work registration and unregistration helpers in drivers/acpi/apei/ghes.c when a GHES interrupt arrives while a CPU holds a CXL CPER work lock. A local privileged user can trigger the locking race to cause a denial of service.
The affected CXL CPER post paths execute in hard IRQ context.
Remediation
Install update from vendor's website.