sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx()

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Summary

CVECVE-2026-68421
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:35 UTC
Updated2026-08-10 13:20:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx() put_prev_task_scx() warns when a runnable task drops to a lower sched_class without SCX_OPS_ENQ_LAST, on the assumption that balance_one() would have kept it running. Core scheduling breaks that: a forced-idle SMT sibling reschedules through the core_pick fast path in pick_next_task(), which skips pick_task_scx() and thus balance_one(), so a runnable task can drop to idle with ENQ_LAST unset. Gate the warning on sched_cpu_cookie_match(): a cookie mismatch means core scheduling forced the idle, while a match (or core scheduling off) still catches a genuine missing-ENQ_LAST drop.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7c65ae81ea86a6ed8086e1a5651acd766187f19b 2907e9d0f05b506dfd58aec589a23042a56ef36b git Not specified
CNA Linux Linux affected 7c65ae81ea86a6ed8086e1a5651acd766187f19b e2f188cdbf8312289532c36eb4e9eb1c9544d43a git Not specified
CNA Linux Linux affected 7c65ae81ea86a6ed8086e1a5651acd766187f19b b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e2f188cdbf8312289532c36eb4e9eb1c9544d43a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2907e9d0f05b506dfd58aec589a23042a56ef36b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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