sched_ext: Keep kick_sync waiting on the rq's own CPU

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Summary

CVECVE-2026-93220
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:17 UTC
Updated2026-09-24 16:17:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Keep kick_sync waiting on the rq's own CPU kick_sync_wait_bal_cb() assumes it runs on the rq's CPU from the __schedule() tail: the snapshots it compares against live in that CPU's percpu area and the busy-wait runs with the rq lock dropped and IRQs enabled. However, dispatch can now drop the rq lock while the callback sits queued, and rq lock takers in that window (the sched class change paths, the scx task iterator) flush pending balance callbacks on release, running the callback on a foreign CPU. Such a run compares against unrelated snapshots and can deadlock when the executing CPU is itself a wait target. Bail on a foreign CPU and leave the wait state alone. The wait only observes progress that the resched kicks already guarantee and the rq's next wait picks up the stale cpus_to_sync bits.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4c95380701f58b8112f0b891de8d160e4199e19d c736ea0fe7b4df920da6bd43a81c5eeecadcc8be git Not specified
CNA Linux Linux affected 4c95380701f58b8112f0b891de8d160e4199e19d e0253dd04beb03e79477c5ef4768b11135687206 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 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/c736ea0fe7b4df920da6bd43a81c5eeecadcc8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0253dd04beb03e79477c5ef4768b11135687206 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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