sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89519
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_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return SCX_RQ_BAL_KEEP tells the pick to keep running the previous task, a leftover from when balancing and picking were separate operations. An rq-level flag only works while dispatches and picks pair up one to one, which core scheduling breaks: selections interleave through dispatch's lock drops and a pick can consume a stale flag, keeping a task that has since been dequeued. Fixing core scheduling support requires the decision to travel with the dispatch that made it. Make scx_dispatch_sched() and balance_one() return an explicit verdict instead and drop the flag's plumbing from the tools autogen enum headers. Also factor the pick-side invocation, its follow-up queueing and the post-dispatch checks out of do_pick_task_scx() into dispatch_pick(). No functional changes intended. v2: Drop the SCX_RQ_BAL_KEEP plumbing from the tools autogen enum headers as well (Andrea).

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.086920000 (date 2026-09-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4c95380701f58b8112f0b891de8d160e4199e19d 6f1d3bfe54430f8d54e0530a27f2ecbf8466576e git Not specified
CNA Linux Linux affected 4c95380701f58b8112f0b891de8d160e4199e19d ffaab58d217581cb75353168f8812a16e10463fc 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/6f1d3bfe54430f8d54e0530a27f2ecbf8466576e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ffaab58d217581cb75353168f8812a16e10463fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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