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CVE-2021-47224

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: ll_temac: Make sure to free skb when it is completely used With the skb pointer piggy-backed on the TX BD, we have a simpl…

Published May 21, 2024CWE-416EPSS 0.23%

Overview

CVE-2021-47224 is a high-severity vulnerability. It was published on May 21, 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:

net: ll_temac: Make sure to free skb when it is completely used

With the skb pointer piggy-backed on the TX BD, we have a simple and

efficient way to free the skb buffer when the frame has been transmitted.

But in order to avoid freeing the skb while there are still fragments from

the skb in use, we need to piggy-back on the TX BD of the skb, not the

first.

Without this, we are doing use-after-free on the DMA side, when the first

BD of a multi TX BD packet is seen as completed in xmit_done, and the

remaining BDs are still being processed.

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/019ab7d044d0ebf97e1236bb8935b7809be92358Refgit.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47Refgit.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3Refgit.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4bRefgit.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358Refgit.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47Refgit.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3Refgit.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47224?

CVE-2021-47224 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47224?

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-2021-47224?

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-2021-47224?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47224 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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