Unchecked Return Value in Linux kernel - CVE-2026-89749
Published: September 12, 2026
Vulnerability identifier: #VU149060
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-2026-89749
CWE-ID: CWE-252
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 an unchecked return value in event_test_stuff() when kthread creation fails. A local user can trigger a kthread creation failure that results in an error pointer being passed to kthread_stop() to cause a denial of service.
The failure can occur under memory pressure during the boot-time event self-test.
Affected software
Linux kernel
How to mitigate CVE-2026-89749
Install security update from vendor's repository.