CVE-2021-47577 (GCVE-0-2021-47577)
Vulnerability from cvelistv5
Published
2024-06-19 14:53
Modified
2025-12-18 11:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: io-wq: check for wq exit after adding new worker task_work We check IO_WQ_BIT_EXIT before attempting to create a new worker, and wq exit cancels pending work if we have any. But it's possible to have a race between the two, where creation checks exit finding it not set, but we're in the process of exiting. The exit side will cancel pending creation task_work, but there's a gap where we add task_work after we've canceled existing creations at exit time. Fix this by checking the EXIT bit post adding the creation task_work. If it's set, run the same cancelation that exit does.
References
Impacted products
Vendor Product Version
Linux Linux Version: 685fe7feedb96771683437107ba72131410e2350
Version: 685fe7feedb96771683437107ba72131410e2350
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