CVE-2026-99058: workqueue: Fix NULL current_pwq deref in chained work check
In the Linux kernel, the following vulnerability has been resolved:
workqueue: Fix NULL currentpwq deref in chained work check
currentwqworker() only tells us that %current is a kworker. It does not guarantee that the worker is currently executing a work item, as worker->currentpwq is populated only while processonework() is running the work function.
ischainedwork() can be reached while queueing on a draining or destroying workqueue. If a kworker outside work-item execution reaches that path, currentwqworker() returns a worker but worker->currentpwq is NULL, and the chained-work test can fault before it emits the intended warning.
Guard the chained-work test with worker->currentpwq. A kworker without currentpwq is not executing work on the target workqueue, so the helper should return false and let the draining/destroying warning fire.
Affected Software
Remediation
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-43.43 - Upgrade
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Event History
Frequently Asked Questions
Under what conditions can this issue be triggered?
The fault can occur when work is queued on a workqueue that is draining or being destroyed, and the caller is a kernel worker thread that is not currently executing a work item. In that state, the worker may be identified as a kworker while its current_pwq pointer is NULL.
What is the practical effect of the flaw?
The chained-work check can dereference a NULL current_pwq pointer and fault before issuing the intended warning about queueing work on a draining or destroying workqueue.
What does the fix change?
The fix guards the chained-work check with a current_pwq presence check. Workers without current_pwq are treated as not executing work on the target workqueue, allowing the draining or destroying workqueue warning to be emitted instead of faulting.