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cve-program · CVE-2026-99058
Published
workqueue: Fix NULL current_pwq deref in chained work check
In the Linux kernel, the following vulnerability has been resolved:
workqueue: Fix NULL current_pwq deref in chained work check
current_wq_worker() only tells us that %current is a kworker. It does
not guarantee that the worker is currently executing a work item, as
worker->current_pwq is populated only while process_one_work() is running
the work function.
is_chained_work() can be reached while queueing on a draining or
destroying workqueue. If a kworker outside work-item execution reaches
that path, current_wq_worker() returns a worker but worker->current_pwq is
NULL, and the chained-work test can fault before it emits the intended
warning.
Guard the chained-work test with worker->current_pwq. A kworker without
current_pwq is not executing work on the target workqueue, so the helper
should return false and let the draining/destroying warning fire.
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