CVE-2024-57876 drm/dp_mst: Fix resetting msg rx state after topology removal
A race condition in the Linux kernel's DisplayPort MST driver can lead to memory corruption, potentially allowing local attackers to execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-57876?
CVE-2024-57876 is a high-severity vulnerability in Linux kernel, published on 11 Jan 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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 in drm_dp_mst_handle_down_rep() and drm_dp_mst_handle_up_req(), however this would require a bigger change. Since the fix is also needed for stable, opting for the simpler solution in this patch.
Which versions are affected by CVE-2024-57876?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-57876?
Apply the vendor's patch.
Is CVE-2024-57876 being exploited?
There is no known exploitation of CVE-2024-57876 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-57876, DEBIAN-CVE-2024-57876, GHSA-3gjf-8gc5-3w3x, ROOT-OS-DEBIAN-11-CVE-2024-57876, ROOT-OS-UBUNTU-2204-CVE-2024-57876, UBUNTU-CVE-2024-57876.