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CVE-2021-47170

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: USB: usbfs: Don't WARN about excessively large memory allocations Syzbot found that the kernel generates a WARNing if the user…

Published Mar 25, 2024CWE-770EPSS 0.24%

Overview

CVE-2021-47170 is a medium-severity vulnerability. It was published on March 25, 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:

USB: usbfs: Don't WARN about excessively large memory allocations

Syzbot found that the kernel generates a WARNing if the user tries to

submit a bulk transfer through usbfs with a buffer that is way too

large. This isn't a bug in the kernel; it's merely an invalid request

from the user and the usbfs code does handle it correctly.

In theory the same thing can happen with async transfers, or with the

packet descriptor table for isochronous transfers.

To prevent the MM subsystem from complaining about these bad

allocation requests, add the __GFP_NOWARN flag to the kmalloc calls

for these buffers.

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/2ab21d6e1411999b5fb43434f421f00bf50002ebRefgit.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83Refgit.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392deRefgit.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2edRefgit.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098Refgit.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002ebRefgit.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83Refgit.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392deRefgit.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2edRefgit.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47170?

CVE-2021-47170 is a medium-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47170?

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-2021-47170?

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-2021-47170?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47170 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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