smb: client: fix races in cifsd thread creation

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Summary

CVECVE-2026-93829
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:16 UTC
Updated2026-09-25 13:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: fix races in cifsd thread creation The cifsd demultiplex thread can run and access tcp_ses before the parent thread has finished populating tcp_ses, which the worker thread accesses locklessly. Also, the kthread_run macro may start the thread before returning the thread pointer. Because the pointer is part of the structure that the thread can access, if the kernel is preempted after the thread is spawned, but before the thread pointer is populated and the thread attempts to exit, it will sleep, waiting for a SIGKILL signal. Fix this by moving creation of the thread to after all of tcp_ses'es fields are populated, and spawning the thread last, using a split kthread_create/wake_up_process logic.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.052190000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected aaf737adb6937339494d5a7111f0433cd9676db8 ee8f811cbac56ffb738b3a73671a9e75b0f56e99 git Not specified
CNA Linux Linux affected aaf737adb6937339494d5a7111f0433cd9676db8 0eee1e6cddd1d9ce14da06e0238ca8d3362dec90 git Not specified
CNA Linux Linux affected aaf737adb6937339494d5a7111f0433cd9676db8 e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d git Not specified
CNA Linux Linux affected 2.6.22 Not specified
CNA Linux Linux unaffected 2.6.22 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0eee1e6cddd1d9ce14da06e0238ca8d3362dec90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee8f811cbac56ffb738b3a73671a9e75b0f56e99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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