CVE-2021-47577

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47577
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47577.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47577
Downstream
Related
Published
2024-06-19T15:15:52Z
Modified
2025-09-29T17:17:13Z
Severity
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

io-wq: check for wq exit after adding new worker task_work

We check IOWQBITEXIT 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 taskwork, 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

Affected packages