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CVE-2021-47339

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot bug report, mistakes in the compat ioctl imple…

Published May 21, 2024CWE-908EPSS 0.24%

Overview

CVE-2021-47339 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

media: v4l2-core: explicitly clear ioctl input data

As seen from a recent syzbot bug report, mistakes in the compat ioctl

implementation can lead to uninitialized kernel stack data getting used

as input for driver ioctl handlers.

The reported bug is now fixed, but it's possible that other related

bugs are still present or get added in the future. As the drivers need

to check user input already, the possible impact is fairly low, but it

might still cause an information leak.

To be on the safe side, always clear the entire ioctl buffer before

calling the conversion handler functions that are meant to initialize

them.

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/7b53cca764f9b291b7907fcd39d9e66ad728ee0bRefgit.kernel.org/stable/c/bfb48b54db25c3b4ef4bef5e0691464ebc4aa335Refgit.kernel.org/stable/c/dc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8Refgit.kernel.org/stable/c/7b53cca764f9b291b7907fcd39d9e66ad728ee0bRefgit.kernel.org/stable/c/bfb48b54db25c3b4ef4bef5e0691464ebc4aa335Refgit.kernel.org/stable/c/dc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47339?

CVE-2021-47339 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47339?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47339?

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-2021-47339?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47339 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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