| From bippy-5f407fcff5a0 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-2024-57798: drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req() |
| |
| While receiving an MST up request message from one thread in |
| drm_dp_mst_handle_up_req(), the MST topology could be removed from |
| another thread via drm_dp_mst_topology_mgr_set_mst(false), freeing |
| mst_primary and setting drm_dp_mst_topology_mgr::mst_primary to NULL. |
| This could lead to a NULL deref/use-after-free of mst_primary in |
| drm_dp_mst_handle_up_req(). |
| |
| Avoid the above by holding a reference for mst_primary in |
| drm_dp_mst_handle_up_req() while it's used. |
| |
| v2: Fix kfreeing the request if getting an mst_primary reference fails. |
| |
| The Linux kernel CVE team has assigned CVE-2024-57798 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.1.123 with commit f61b2e5e7821f868d6afc22382a66a30ee780ba0 |
| Fixed in 6.6.69 with commit 9735d40f5fde9970aa46e828ecc85c32571d58a2 |
| Fixed in 6.12.8 with commit ce55818b2d3a999f886af91679589e4644ff1dc8 |
| Fixed in 6.13 with commit e54b00086f7473dbda1a7d6fc47720ced157c6a8 |
| |
| 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-2024-57798 |
| 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/display/drm_dp_mst_topology.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/f61b2e5e7821f868d6afc22382a66a30ee780ba0 |
| https://git.kernel.org/stable/c/9735d40f5fde9970aa46e828ecc85c32571d58a2 |
| https://git.kernel.org/stable/c/ce55818b2d3a999f886af91679589e4644ff1dc8 |
| https://git.kernel.org/stable/c/e54b00086f7473dbda1a7d6fc47720ced157c6a8 |
