Deadlock in Linux kernel - CVE-2026-89589
Published: September 12, 2026
Vulnerability identifier: #VU149214
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89589
CWE-ID: CWE-833
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89589
Install security update from vendor's repository.