Kernel Crash Issue in Linux Kernel Affecting Task Management

CVE-2026-89749

What is CVE-2026-89749?

A critical issue in the Linux kernel relates to improper error handling within the task management subsystem. Specifically, when the event_test_stuff() function invokes kthread_run(), it may return an invalid pointer, such as ERR_PTR(-ENOMEM), if the kernel encounters memory pressure during self-testing. The subsequent call to kthread_stop() attempts to dereference this invalid pointer, resulting in a kernel crash. To mitigate this, it is essential to check the result of kthread_run() before passing it to kthread_stop(), and implement WARN_ON() to ensure that any failure in thread creation is logged, thereby enhancing system stability.

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