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CVE-2021-47586

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup KASAN reports an out-of-bounds read in rk_gmac_setup on the line: while…

Published Jun 19, 2024CWE-125EPSS 0.21%

Overview

CVE-2021-47586 is a medium-severity vulnerability. It was published on June 19, 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:

net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup

KASAN reports an out-of-bounds read in rk_gmac_setup on the line:

while (ops->regs[i]) {

This happens for most platforms since the regs flexible array member is

empty, so the memory after the ops structure is being read here. It

seems that mostly this happens to contain zero anyway, so we get lucky

and everything still works.

To avoid adding redundant data to nearly all the ops structures, add a

new flag to indicate whether the regs field is valid and avoid this loop

when it is not.

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/0546b224cc7717cc8a2db076b0bb069a9c430794Refgit.kernel.org/stable/c/0b4a5d1e15ce72f69be48f38dc0401dab890ae0fRefgit.kernel.org/stable/c/0546b224cc7717cc8a2db076b0bb069a9c430794Refgit.kernel.org/stable/c/0b4a5d1e15ce72f69be48f38dc0401dab890ae0f

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47586?

CVE-2021-47586 is a medium-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47586?

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-2021-47586?

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-2021-47586?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47586 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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