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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
9408cc94eb041d0c2f9f00189a613b94c0449450 to < f61b2e5e7821f868d6afc22382a66a30ee780ba0affected9408cc94eb041d0c2f9f00189a613b94c0449450 to < 9735d40f5fde9970aa46e828ecc85c32571d58a2affected9408cc94eb041d0c2f9f00189a613b94c0449450 to < ce55818b2d3a999f886af91679589e4644ff1dc8affected9408cc94eb041d0c2f9f00189a613b94c0449450 to < e54b00086f7473dbda1a7d6fc47720ced157c6a8affected
Linux Linux
Default version status: affected
5.5affected0 to < 5.5unaffected6.1.123 to ≤ 6.1.*unaffected6.6.69 to ≤ 6.6.*unaffected6.12.8 to ≤ 6.12.*unaffected6.13 to ≤ *unaffected
References
- 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 ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html ↗