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CVE-2021-47494

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: cfg80211: fix management registrations locking The management registrations locking was broken, the list was locked for each wd…

Published May 22, 2024CWE-667EPSS 0.17%

Overview

CVE-2021-47494 is a high-severity vulnerability. It was published on May 22, 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:

cfg80211: fix management registrations locking

The management registrations locking was broken, the list was

locked for each wdev, but cfg80211_mgmt_registrations_update()

iterated it without holding all the correct spinlocks, causing

list corruption.

Rather than trying to fix it with fine-grained locking, just

move the lock to the wiphy/rdev (still need the list on each

wdev), we already need to hold the wdev lock to change it, so

there's no contention on the lock in any case. This trivially

fixes the bug since we hold one wdev's lock already, and now

will hold the lock that protects all lists.

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/09b1d5dc6ce1c9151777f6c4e128a59457704c97Refgit.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420eRefgit.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4Refgit.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97Refgit.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420eRefgit.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47494?

CVE-2021-47494 is a high-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47494?

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-2021-47494?

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-2021-47494?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47494 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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