CVE-2025-21956
drm/amd/display: Assign normalized_pix_clk when color depth = 14
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)
INFO
Published Date :
April 1, 2025, 4:15 p.m.
Last Modified :
Nov. 3, 2025, 8:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to include the fix.
- Ensure the display driver handles color depth correctly.
- Test the fix in the Radeon RX 6600 XT environment.
- Apply the cherry-picked commit to the relevant kernel version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-21956.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-21956 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-21956
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-21956 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-21956 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html Added Reference https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html -
Initial Analysis by [email protected]
Oct. 31, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 5.4.292 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.236 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.180 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.132 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.84 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.20 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.13.8 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0174a2e5770efee9dbd4b58963ed4d939298ff5e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/04f90b505ad3a6eed474bbaa03167095fef5203a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0c0016712e5dc23ce4a7e673cbebc24a535d8c8a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/27df30106690969f7d63604f0d49ed8e9bffa2cb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/79e31396fdd7037c503e6add15af7cb00633ea92 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a8f77e1658d78e4a8bb227a83bcee67de97f7634 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cca3ab74f90176099b6392e8e894b52b27b3d080 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dc831b38680c47d07e425871a9852109183895cf Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 10, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/0174a2e5770efee9dbd4b58963ed4d939298ff5e Added Reference https://git.kernel.org/stable/c/0c0016712e5dc23ce4a7e673cbebc24a535d8c8a Added Reference https://git.kernel.org/stable/c/cca3ab74f90176099b6392e8e894b52b27b3d080 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 01, 2025
Action Type Old Value New Value Added 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) Added Reference https://git.kernel.org/stable/c/04f90b505ad3a6eed474bbaa03167095fef5203a Added Reference https://git.kernel.org/stable/c/27df30106690969f7d63604f0d49ed8e9bffa2cb Added Reference https://git.kernel.org/stable/c/79e31396fdd7037c503e6add15af7cb00633ea92 Added Reference https://git.kernel.org/stable/c/a8f77e1658d78e4a8bb227a83bcee67de97f7634 Added Reference https://git.kernel.org/stable/c/dc831b38680c47d07e425871a9852109183895cf