CVE-2026-89749

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

tracing: Fix crash passing ERR_PTR to kthread_stop()

event_test_stuff() calls kthread_run() and unconditionally passes the

returned task_struct pointer to kthread_stop(). kthread_run() returns an

error pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for

example under memory pressure during the boot-time event self-test.

kthread_stop() then dereferences the invalid pointer, crashing the kernel.

Check the result of kthread_run() before passing it to kthread_stop(). Use

WARN_ON() so that a failure to create the self-test thread does not go

unnoticed, matching the ring-buffer self-test fix in commit

91542863abad ("ring-buffer: Fix crash passing ERR_PTR to kthread_stop()").

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References