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Vulnerability DatabaseCVE-2025-21956
CVE-2025-21956:
Linux Kernel vulnerability analysis and mitigation
Overview
A vulnerability was discovered in the Linux kernel affecting the AMD display driver (drm/amd/display) component, specifically related to color depth handling. The issue was identified and disclosed on April 1, 2025, and is tracked as CVE-2025-21956. The vulnerability affects systems using AMD Radeon RX 6600 XT graphics cards (NVD).
Technical details
The vulnerability occurs when the display color depth is set to 14 bits (COLOR_DEPTH_141414) in the AMD display driver. This condition triggers a warning message 'WARNING: CPU: 4 PID: 459 at ... /dc_resource.c:3397 calculate_phy_pix_clks+0xef/0x100 [amdgpu]' due to improper handling of the normalized pixel clock calculations (NVD).
Impact
The impact of this vulnerability appears to be limited to system warnings and potential display issues when using 14-bit color depth on affected AMD graphics hardware (Debian Security).
Mitigation and workarounds
The vulnerability has been fixed in Linux kernel version 6.1.133-1 for Debian bookworm and version 6.12.22-1 for Debian sid. The fix involves properly assigning the normalized pixel clock value using the formula pix_clk * (14 * 3) / 24 when the color depth is set to 14 bits (Debian Security, Debian Advisory).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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