5.5

CVE-2025-21956: drm/amd/display: Assign normalized_pix_clk when color depth = 14

Modified
AliasesUBUNTU-CVE-2025-21956DEBIAN-CVE-2025-21956
Published 01-04-2025Last modified 11-05-2026

Vulnerability summary

CVE-2025-21956 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 55 · Related 50
DLA-4178-1DLA-4193-1DSA-5900-1MGASA-2025-0142MGASA-2025-0146SUSE-SU-2025:01600-1

Timeline

  1. 01-04-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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)

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu138 products
  • linuxAll versions (No fix recorded) | < 5.4.0-218.238 | < 5.15.0-142.152 | < 6.8.0-84.84
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1147.157 | < 5.15.0-1086.93 | < 6.8.0-1039.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < cca3ab74f90176099b6392e8e894b52b27b3d080 | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < 0174a2e5770efee9dbd4b58963ed4d939298ff5e | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < 0c0016712e5dc23ce4a7e673cbebc24a535d8c8a | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < dc831b38680c47d07e425871a9852109183895cf | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < a8f77e1658d78e4a8bb227a83bcee67de97f7634 | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < 04f90b505ad3a6eed474bbaa03167095fef5203a | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < 27df30106690969f7d63604f0d49ed8e9bffa2cb | ≥ 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, < 79e31396fdd7037c503e6add15af7cb00633ea92 | 4.15
  • linux_kernel≥ 4.15, < 5.4.292 | ≥ 5.5, < 5.10.236 | ≥ 5.11, < 5.15.180 | ≥ 5.16, < 6.1.132 | ≥ 6.2, < 6.6.84 | ≥ 6.7, < 6.12.20 | ≥ 6.13, < 6.13.8 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5 | 6.14:rc6
Debian1 product
  • linux< 6.1.133-1 | < 6.12.20-1

3 vendors · 141 products

References

53 links
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