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CVE-2021-47444

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compli…

Published May 22, 2024EPSS 0.22%

Overview

CVE-2021-47444 is a medium-severity vulnerability. It was published on May 22, 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:

drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read

In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid

corruption test") the function connector_bad_edid() started assuming

that the memory for the EDID passed to it was big enough to hold

`edid[0x7e] + 1` blocks of data (1 extra for the base block). It

completely ignored the fact that the function was passed `num_blocks`

which indicated how much memory had been allocated for the EDID.

Let's fix this by adding a bounds check.

This is important for handling the case where there's an error in the

first block of the EDID. In that case we will call

connector_bad_edid() without having re-allocated memory based on

`edid[0x7e]`.

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/09f3946bb452918dbfb1982add56f9ffaae393dcRefgit.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0Refgit.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7Refgit.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dcRefgit.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0Refgit.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47444?

CVE-2021-47444 is a medium-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47444?

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-2021-47444?

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-2021-47444?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47444 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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