tracing: Drain deferred trigger frees if kthread creation fails

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Summary

CVECVE-2026-31481
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:45 UTC
Updated2026-04-22 14:16:45 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tracing: Drain deferred trigger frees if kthread creation fails Boot-time trigger registration can fail before the trigger-data cleanup kthread exists. Deferring those frees until late init is fine, but the post-boot fallback must still drain the deferred list if kthread creation never succeeds. Otherwise, boot-deferred nodes can accumulate on trigger_data_free_list, later frees fall back to synchronously freeing only the current object, and the older queued entries are leaked forever. To trigger this, add the following to the kernel command line: trace_event=sched_switch trace_trigger=sched_switch.traceon,sched_switch.traceon The second traceon trigger will fail and be freed. This triggers a NULL pointer dereference and crashes the kernel. Keep the deferred boot-time behavior, but when kthread creation fails, drain the whole queued list synchronously. Do the same in the late-init drain path so queued entries are not stranded there either.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 61d445af0a7c70018111919e47beaaee15653f2f 771624b7884a83bb9f922ae64ee41a5f8b7576c9 git Not specified
CNA Linux Linux affected 61d445af0a7c70018111919e47beaaee15653f2f 250ab25391edeeab8462b68be42e4904506c409c git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/250ab25391edeeab8462b68be42e4904506c409c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/771624b7884a83bb9f922ae64ee41a5f8b7576c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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