| 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-2025-21985: drm/amd/display: Fix out-of-bound accesses |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Fix out-of-bound accesses |
| |
| [WHAT & HOW] |
| hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), |
| but location can have size up to 6. As a result, it is necessary to |
| check location against MAX_HPO_DP2_ENCODERS. |
| |
| Similiarly, disp_cfg_stream_location can be used as an array index which |
| should be 0..5, so the ASSERT's conditions should be less without equal. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21985 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.12.20 with commit 36793d90d76f667d26c6dd025571481ee0c96abc |
| Fixed in 6.13.8 with commit 9aedc776b11038f04f4641241bb7e877781e4aa4 |
| Fixed in 6.14 with commit 8adbb2a98b00926315fd513b5fe2596b5716b82d |
| |
| 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-2025-21985 |
| 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/dml2/dml21/dml21_translation_helper.c |
| drivers/gpu/drm/amd/display/dc/dml2/dml2_translation_helper.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/36793d90d76f667d26c6dd025571481ee0c96abc |
| https://git.kernel.org/stable/c/9aedc776b11038f04f4641241bb7e877781e4aa4 |
| https://git.kernel.org/stable/c/8adbb2a98b00926315fd513b5fe2596b5716b82d |
