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.
History

Tue, 14 Jan 2025 08:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low


Sat, 11 Jan 2025 12:45:00 +0000

Type Values Removed Values Added
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.
Title drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req()
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-01-11T12:39:48.212Z

Updated: 2025-01-11T12:39:48.212Z

Reserved: 2025-01-11T12:32:49.420Z

Link: CVE-2024-57798

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-01-11T13:15:29.743

Modified: 2025-01-11T13:15:29.743

Link: CVE-2024-57798

cve-icon Redhat

Severity : Low

Publid Date: 2025-01-11T00:00:00Z

Links: CVE-2024-57798 - Bugzilla