CVE-2024-46870 Information

Description

In the Linux kernel the following vulnerability has been resolved:

drm/amd/display: Disable DMCUB timeout for DCN35

[Why] DMCUB can intermittently take longer than expected to process commands.

Old ASIC policy was to continue while logging a diagnostic error - which works fine for ASIC without IPS but with IPS this could lead to a race condition where we attempt to access DCN state while it’s inaccessible leading to a system hang when the NIU port is not disabled or register accesses that timeout and the display configuration in an undefined state.

[How] We need to investigate why these accesses take longer than expected but for now we should disable the timeout on DCN35 to avoid this race condition. Since the waits happen only at lower interrupt levels the risk of taking too long at higher IRQ and causing a system watchdog timeout are minimal.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

https://git.kernel.org/stable/c/31c254c9cd4b122a10db297124f867107a696d83 https://git.kernel.org/stable/c/7c70e60fbf4bff1123f0e8d5cb1ae71df6164d7f

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

4.7