sched_ext: Abort directly from the hardlockup handler

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Summary

CVECVE-2026-90432
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:48 UTC
Updated2026-09-17 17:17:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Abort directly from the hardlockup handler scx_hardlockup() defers the abort to an irq_work because exit claiming used to take scx_sched_lock and couldn't run from NMI. The deferral is now unnecessary - claiming is NMI-safe and asserting ->aborting is exactly what breaks the live-locks that hard-lock CPUs. Call handle_lockup() directly and drop the irq_work. This also makes the self-detected case recoverable: the perf watchdog fires on the hard-locked CPU itself, where a queued irq_work never runs with IRQs off. Also fix the return value: %true used to be returned whenever sched_ext was loaded, suppressing the kernel's hardlockup report even when the abort was refused. Return %true only when this call initiated the abort.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bd2d76455b65aab77652823919db128a8e585825 4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed git Not specified
CNA Linux Linux affected bd2d76455b65aab77652823919db128a8e585825 3c4b38064937a761ebbf85b1649e812db85eb59e git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.6 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/4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c4b38064937a761ebbf85b1649e812db85eb59e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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