Linux Kernel Workqueue: Null Dref via Current_pwq Deref (CVE-2026-99058)
CVE-2026-99058 Published on October 23, 2026
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.
Products Associated with CVE-2026-99058
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Affected Versions
Linux:- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 73bec442f913855907b63225306dd162c18e5c71 is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 6877de2c75f0dd342099a1357856e6c8d474abc3 is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 54361e4924c2c52a501b74ef10217c32f45fccfa is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 3dc61af2998cfc7312d6e59bbdcd5eed074483f2 is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 729d576df89c7e4341e58c452f8890620a610ac2 is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below b12a25fb2b9d5dac80e419d695450cc17a51fdfd is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 1a2668682e998039a027796b236319b380078a6a is affected.
- Version 8d03ecfe471802d6afe97da97722b6924533aa82 and below 980db94e3eeefdd8a1c46f86412c33a7f7806f51 is affected.
- Version 3.9 is affected.
- Before 3.9 is unaffected.
- Version 5.10.273, <= 5.10.* is unaffected.
- Version 5.15.224, <= 5.15.* is unaffected.
- Version 6.1.191, <= 6.1.* is unaffected.
- Version 6.6.160, <= 6.6.* is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.