| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-38240: drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr |
| |
| The function mtk_dp_wait_hpd_asserted() may be called before the |
| `mtk_dp->drm_dev` pointer is assigned in mtk_dp_bridge_attach(). |
| Specifically it can be called via this callpath: |
| - mtk_edp_wait_hpd_asserted |
| - [panel probe] |
| - dp_aux_ep_probe |
| |
| Using "drm" level prints anywhere in this callpath causes a NULL |
| pointer dereference. Change the error message directly in |
| mtk_dp_wait_hpd_asserted() to dev_err() to avoid this. Also change the |
| error messages in mtk_dp_parse_capabilities(), which is called by |
| mtk_dp_wait_hpd_asserted(). |
| |
| While touching these prints, also add the error code to them to make |
| future debugging easier. |
| |
| The Linux kernel CVE team has assigned CVE-2025-38240 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit 7eacba9a083be65c0f251c19380ec01147c01ebc and fixed in 6.6.87 with commit 13ec849fd2eab808ee8eba2625df7ebea3b85edf |
| Issue introduced in 6.6 with commit 7eacba9a083be65c0f251c19380ec01147c01ebc and fixed in 6.12.23 with commit 57a9fb47551b33cde7b76d17c0072c3b394f4620 |
| Issue introduced in 6.6 with commit 7eacba9a083be65c0f251c19380ec01147c01ebc and fixed in 6.13.11 with commit 2fda391ef7a701748abd7fa32232981b522c1e07 |
| Issue introduced in 6.6 with commit 7eacba9a083be65c0f251c19380ec01147c01ebc and fixed in 6.14.2 with commit 149a5c38436c229950cf1020992ce65c9549bc19 |
| Issue introduced in 6.6 with commit 7eacba9a083be65c0f251c19380ec01147c01ebc and fixed in 6.15 with commit 106a6de46cf4887d535018185ec528ce822d6d84 |
| |
| 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-2025-38240 |
| 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/mediatek/mtk_dp.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/13ec849fd2eab808ee8eba2625df7ebea3b85edf |
| https://git.kernel.org/stable/c/57a9fb47551b33cde7b76d17c0072c3b394f4620 |
| https://git.kernel.org/stable/c/2fda391ef7a701748abd7fa32232981b522c1e07 |
| https://git.kernel.org/stable/c/149a5c38436c229950cf1020992ce65c9549bc19 |
| https://git.kernel.org/stable/c/106a6de46cf4887d535018185ec528ce822d6d84 |
