CVE-2024-57876

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/dp_mst: Fix resetting msg rx state after topology removal

If the MST topology is removed during the reception of an MST down reply

or MST up request sideband message, the

drm_dp_mst_topology_mgr::up_req_recv/down_rep_recv states could be reset

from one thread via drm_dp_mst_topology_mgr_set_mst(false), racing with

the reading/parsing of the message from another thread via

drm_dp_mst_handle_down_rep() or drm_dp_mst_handle_up_req(). The race is

possible since the reader/parser doesn't hold any lock while accessing

the reception state. This in turn can lead to a memory corruption in the

reader/parser as described by commit bd2fccac61b4 ("drm/dp_mst: Fix MST

sideband message body length check").

Fix the above by resetting the message reception state if needed before

reading/parsing a message. Another solution would be to hold the

drm_dp_mst_topology_mgr::lock for the whole duration of the message

reception/parsing i

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References