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CVE-2021-47105

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ice: xsk: return xsk buffers back to pool when cleaning the ring Currently we only NULL the xdp_buff pointer in the internal SW…

Published Mar 4, 2024CWE-401EPSS 0.29%

Overview

CVE-2021-47105 is a medium-severity vulnerability. It was published on March 4, 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:

ice: xsk: return xsk buffers back to pool when cleaning the ring

Currently we only NULL the xdp_buff pointer in the internal SW ring but

we never give it back to the xsk buffer pool. This means that buffers

can be leaked out of the buff pool and never be used again.

Add missing xsk_buff_free() call to the routine that is supposed to

clean the entries that are left in the ring so that these buffers in the

umem can be used by other sockets.

Also, only go through the space that is actually left to be cleaned

instead of a whole ring.

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/ad6d20da2cfbe14b7b1200d15f39e65988b0b9e8Refgit.kernel.org/stable/c/afe8a3ba85ec2a6b6849367e25c06a2f8e0ddd05Refgit.kernel.org/stable/c/ad6d20da2cfbe14b7b1200d15f39e65988b0b9e8Refgit.kernel.org/stable/c/afe8a3ba85ec2a6b6849367e25c06a2f8e0ddd05

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47105?

CVE-2021-47105 is a medium-severity vulnerability. It was published on March 4, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47105?

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-2021-47105?

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-2021-47105?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47105 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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