sched_ext: Don't run ops.dequeue() with a DSQ lock held

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98865
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:40 UTC
Updated2026-10-19 10:19:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Don't run ops.dequeue() with a DSQ lock held ops.dequeue() is invoked with the source user DSQ's lock still held on the consume and move paths (scx_consume_dispatch_q(), move_task_between_dsqs()). A BPF scheduler which locks the source user DSQ from ops.dequeue() - e.g. by iterating it with bpf_iter_scx_dsq - self-deadlocks. ops.dequeue() can only call the "any" kfuncs and none of them can lock a builtin DSQ, so the global and bypass paths can't deadlock; however, all DSQ locks share one lockdep class, so iterating any user DSQ from ops.dequeue() on those paths trips the recursion check. Move the invocation after the DSQ unlock on all three paths. SCX_TASK_IN_CUSTODY is cleared under the lock serializing the transfer so that the callback is invoked exactly once.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d fe499ae9da46e297f578d4346c4c8e338c3118db git Not specified
CNA Linux Linux affected ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d cb86607ada73185f321baa7f9d94a08a3a40bbf5 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fe499ae9da46e297f578d4346c4c8e338c3118db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb86607ada73185f321baa7f9d94a08a3a40bbf5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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