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CVE-2021-47476

4.6 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: comedi: ni_usb6501: fix NULL-deref in command paths The driver uses endpoint-sized USB transfer buffers but had no sanity check…

Published May 22, 2024CWE-476EPSS 0.39%

Overview

CVE-2021-47476 is a medium-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 4.6 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.6, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

comedi: ni_usb6501: fix NULL-deref in command paths

The driver uses endpoint-sized USB transfer buffers but had no sanity

checks on the sizes. This can lead to zero-size-pointer dereferences or

overflowed transfer buffers in ni6501_port_command() and

ni6501_counter_command() if a (malicious) device has smaller max-packet

sizes than expected (or when doing descriptor fuzz testing).

Add the missing sanity checks to probe().

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/4a9d43cb5d5f39fa39fc1da438517004cc95f7eaRefgit.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224Refgit.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440Refgit.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816Refgit.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3Refgit.kernel.org/stable/c/bc51111bf6e8e7b6cc94b133e4c291273a16acd1Refgit.kernel.org/stable/c/d6a727a681a39ae4f73081a9bedb45d14f95bdd1Refgit.kernel.org/stable/c/df7b1238f3b599a0b9284249772cdfd1ea83a632Refgit.kernel.org/stable/c/ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1Refgit.kernel.org/stable/c/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47476?

CVE-2021-47476 is a medium-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 4.6 (MEDIUM).

How severe is CVE-2021-47476?

This vulnerability has a CVSS 3.1 base score of 4.6, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47476?

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-2021-47476?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47476 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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