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CVE-2021-47577

7.8 · HIGH

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, an…

Published Jun 19, 2024CWE-362EPSS 0.15%

Overview

CVE-2021-47577 is a high-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/4b4e5bbf9386d4ec21d91c0cb0fd60b9bba778ecRefgit.kernel.org/stable/c/71a85387546e50b1a37b0fa45dadcae3bfb35cf6Refgit.kernel.org/stable/c/4b4e5bbf9386d4ec21d91c0cb0fd60b9bba778ecRefgit.kernel.org/stable/c/71a85387546e50b1a37b0fa45dadcae3bfb35cf6

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47577?

CVE-2021-47577 is a high-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47577?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47577?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47577?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47577 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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