7.8

CVE-2024-57798

drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 6.1.123
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.69
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.8
Linux ≫ Linux Kernel Version6.13 Updaterc1
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.117
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/9735d40f5fde9970aa46e828ecc85c32571d58a2
Patch
https://git.kernel.org/stable/c/ce55818b2d3a999f886af91679589e4644ff1dc8
Patch
https://git.kernel.org/stable/c/e54b00086f7473dbda1a7d6fc47720ced157c6a8
Patch
https://git.kernel.org/stable/c/f61b2e5e7821f868d6afc22382a66a30ee780ba0
Patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html