tracing: Fix crash passing ERR_PTR to kthread_stop()

Summary

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()").

Timeline

1. Sep 11, 2026, 7:46 PM UTCCVE published
2. Oct 19, 2026, 8:52 AM UTCRecord last updated

Affected versions

• Linux Linux

  From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in c1a4fb7aa290f158d50654d640292e49d9055fd1; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in 42ccb215ef0a552acbbd32f81009bfe4b278ba77; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in 98d06fb9865a490e12ebe32d65b9ffac6108614d; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in ceb1707aef5824cf024eb82d10787b7621e2ff35; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in 12a499f741fc5be3731c8b0a0d909406575cc2eb; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in adadf4192f700bca82abfda9fa6d58c0bf37cc04; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in c40e0b4fa365969e67011529eabdfb66d1022256; From e6187007d6c365b551c69ea3df46f06fd1c8bd19 · fixed in 649bc7df3e5d7be6f7996a95084037dbf3cad1e5

• Linux Linux

  2.6.31

• KernelLinux

  From 2.6.31 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8