Use-after-free in Linux kernel - CVE-2026-89570
Published: September 12, 2026
Vulnerability identifier: #VU149228
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89570
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the CXL machine check exception notifier when handling machine check exceptions for CXL regions. A local user can trigger the vulnerable CXL machine check exception handler to cause a denial of service.
Only CXL regions with an extended linear cache are affected.
Affected software
Linux kernel
How to mitigate CVE-2026-89570
Install security update from vendor's repository.