CVE-2021-47577 (GCVE-0-2021-47577)

Vulnerability from cvelistv5 – Published: 2024-06-19 14:53 – Updated: 2025-12-18 11:37
VLAI?
Title
io-wq: check for wq exit after adding new worker task_work
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 685fe7feedb96771683437107ba72131410e2350 , < 4b4e5bbf9386d4ec21d91c0cb0fd60b9bba778ec (git)
Affected: 685fe7feedb96771683437107ba72131410e2350 , < 71a85387546e50b1a37b0fa45dadcae3bfb35cf6 (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.11 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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