tracing: Fix crash passing ERR_PTR to kthread_stop()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89749
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:05 UTC
Updated2026-09-11 20:20:05 UTC
DescriptionIn 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()").

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e6187007d6c365b551c69ea3df46f06fd1c8bd19 12a499f741fc5be3731c8b0a0d909406575cc2eb git Not specified
CNA Linux Linux affected e6187007d6c365b551c69ea3df46f06fd1c8bd19 adadf4192f700bca82abfda9fa6d58c0bf37cc04 git Not specified
CNA Linux Linux affected e6187007d6c365b551c69ea3df46f06fd1c8bd19 c40e0b4fa365969e67011529eabdfb66d1022256 git Not specified
CNA Linux Linux affected e6187007d6c365b551c69ea3df46f06fd1c8bd19 649bc7df3e5d7be6f7996a95084037dbf3cad1e5 git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c40e0b4fa365969e67011529eabdfb66d1022256 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12a499f741fc5be3731c8b0a0d909406575cc2eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/adadf4192f700bca82abfda9fa6d58c0bf37cc04 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/649bc7df3e5d7be6f7996a95084037dbf3cad1e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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