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CVE-2025-21956

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Assign normalized_pix_clk when color depth = 14 [WHY & HOW] A warning message "WARNING: CPU: 4 PID: 459 at ...

Published Apr 1, 2025EPSS 0.23%

Overview

CVE-2025-21956 is a medium-severity vulnerability. It was published on April 1, 2025 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/amd/display: Assign normalized_pix_clk when color depth = 14

[WHY & HOW]

A warning message "WARNING: CPU: 4 PID: 459 at ... /dc_resource.c:3397

calculate_phy_pix_clks+0xef/0x100 [amdgpu]" occurs because the

display_color_depth == COLOR_DEPTH_141414 is not handled. This is

observed in Radeon RX 6600 XT.

It is fixed by assigning pix_clk * (14 * 3) / 24 - same as the rests.

Also fixes the indentation in get_norm_pix_clk.

(cherry picked from commit 274a87eb389f58eddcbc5659ab0b180b37e92775)

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/0174a2e5770efee9dbd4b58963ed4d939298ff5eRefgit.kernel.org/stable/c/04f90b505ad3a6eed474bbaa03167095fef5203aRefgit.kernel.org/stable/c/0c0016712e5dc23ce4a7e673cbebc24a535d8c8aRefgit.kernel.org/stable/c/27df30106690969f7d63604f0d49ed8e9bffa2cbRefgit.kernel.org/stable/c/79e31396fdd7037c503e6add15af7cb00633ea92Refgit.kernel.org/stable/c/a8f77e1658d78e4a8bb227a83bcee67de97f7634Refgit.kernel.org/stable/c/cca3ab74f90176099b6392e8e894b52b27b3d080Refgit.kernel.org/stable/c/dc831b38680c47d07e425871a9852109183895cfReflists.debian.org/debian-lts-announce/2025/05/msg00030.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00045.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21956?

CVE-2025-21956 is a medium-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21956?

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-2025-21956?

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-2025-21956?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21956 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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