sched/core: Make core-sched flips wait for in-flight selections

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89520
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:34 UTC
Updated2026-09-11 20:19:34 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched/core: Make core-sched flips wait for in-flight selections Core scheduling's pick_next_task() operates on all sibling rqs under one acquisition of the shared core-wide lock. A ->pick_task() that releases the rq lock leaves every sibling __lock momentarily free, letting __sched_core_flip(false) complete mid-selection and rebind rq_lockp() under it. The selection resumes on the split locks, touching sibling state it no longer protects, and __schedule() finally releases a lock that was never taken while leaking the one that was. Count in-flight core-wide selections in the leader's rq->core_pick_in_flight and make __sched_core_flip() wait for the count to drain. The count only changes under the shared lock, which the flip holds while sampling, so no other ordering is needed. The wait can repeat while selections overlap, but the flip backs off between samples and flips are rare cookie-lifetime events. sched_core_cpu_deactivate() moves the count to the new leader - a stale copy left behind would bias it forever if that CPU later returns as its own leader.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 539f65125d20aacab54d02d77f10a839f45b09dc 9d69422ddaa13526c2223444e237d948d6e44728 git Not specified
CNA Linux Linux affected 539f65125d20aacab54d02d77f10a839f45b09dc 23eda24f325a6e6d686d30ec75f2e9d6745e2015 git Not specified
CNA Linux Linux affected 539f65125d20aacab54d02d77f10a839f45b09dc f3629c63a4af3e491381780bc6c123cb498c4c40 git Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 6.18.51 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/9d69422ddaa13526c2223444e237d948d6e44728 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f3629c63a4af3e491381780bc6c123cb498c4c40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/23eda24f325a6e6d686d30ec75f2e9d6745e2015 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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