CVE-2026-98864 - sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task

CVE-2026-98864 - sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task

https://cvefeed.io/rssfeed/latest.atom / Sun, 10/18/2026 - 19:53
CVE ID :CVE-2026-98864
Published : Oct. 18, 2026, 4:17 p.m. | 1 hour, 32 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task ebf1ccff79c4 ("sched_ext: Fix ops.dequeue() semantics") moved the final ops_state store in scx_dispatch_enqueue() after the DSQ unlock so that the custody update and ops.dequeue() precede it. A task can thus be found on a DSQ while still SCX_OPSS_DISPATCHING. The dequeue and core-sched pick paths wait for the state to clear in ops_dequeue() but the reenqueue paths don't. A reenqueue in that window runs ops.enqueue() and sets SCX_OPSS_QUEUED before the dispatch has completed. The dispatcher's final store then overwrites it with SCX_OPSS_NONE and finish_dispatch() drops every later dispatch of the task. Wait for SCX_OPSS_DISPATCHING to clear before dequeueing a task for reenqueue, the same way ops_dequeue() does.
Severity: 0.0 | NA
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