| From bippy-7c5fe7eed585 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: 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) |
| |
| The Linux kernel CVE team has assigned CVE-2025-21956 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.292 with commit cca3ab74f90176099b6392e8e894b52b27b3d080 |
| Fixed in 5.10.236 with commit 0174a2e5770efee9dbd4b58963ed4d939298ff5e |
| Fixed in 5.15.180 with commit 0c0016712e5dc23ce4a7e673cbebc24a535d8c8a |
| Fixed in 6.1.132 with commit dc831b38680c47d07e425871a9852109183895cf |
| Fixed in 6.6.84 with commit a8f77e1658d78e4a8bb227a83bcee67de97f7634 |
| Fixed in 6.12.20 with commit 04f90b505ad3a6eed474bbaa03167095fef5203a |
| Fixed in 6.13.8 with commit 27df30106690969f7d63604f0d49ed8e9bffa2cb |
| Fixed in 6.14 with commit 79e31396fdd7037c503e6add15af7cb00633ea92 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21956 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/gpu/drm/amd/display/dc/core/dc_resource.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/cca3ab74f90176099b6392e8e894b52b27b3d080 |
| https://git.kernel.org/stable/c/0174a2e5770efee9dbd4b58963ed4d939298ff5e |
| https://git.kernel.org/stable/c/0c0016712e5dc23ce4a7e673cbebc24a535d8c8a |
| https://git.kernel.org/stable/c/dc831b38680c47d07e425871a9852109183895cf |
| https://git.kernel.org/stable/c/a8f77e1658d78e4a8bb227a83bcee67de97f7634 |
| https://git.kernel.org/stable/c/04f90b505ad3a6eed474bbaa03167095fef5203a |
| https://git.kernel.org/stable/c/27df30106690969f7d63604f0d49ed8e9bffa2cb |
| https://git.kernel.org/stable/c/79e31396fdd7037c503e6add15af7cb00633ea92 |
