CVE-2023-52460

What it actually does

NULL pointer dereference in the AMD display driver (drm/amd/display) when the source context lacks a clk_mgr during the hibernate sequence, causing a kernel crash.

Why it matters to the business

Systems using affected AMD graphics hardware may experience unexpected crashes or loss of availability during hibernation or suspend operations, potentially disrupting user workflows or scheduled maintenance on Linux servers and workstations.

How an attack unfolds

An attacker with local access on a vulnerable Linux kernel initiates the hibernate sequence on an AMD GPU system where the display context is missing the expected clock manager, triggering the NULL dereference and resulting in denial of service.

How to fix it

Upgrade the Linux kernel to a fixed version such as 6.7.2 or later, or apply the commit 6b80326efff093d037e0971831dca6ebddba9b45 (or 7bbf3b67cb49d0f8a20e64b7473923041b758211) in stable trees. Rebuild and reboot with the patched kernel.

How to confirm the fix worked

Verify the running kernel version is at or above the fixed release, confirm the presence of the resolving commit in the source tree, and test hibernate functionality on AMD hardware to ensure no crash occurs.

Typical attack path

1. Gain local user access to a Linux system with affected AMD display hardware
2. Trigger system hibernate or suspend via user command or power management interface
3. Cause the display driver to attempt DML2 lookup without a valid clk_mgr
4. Trigger kernel panic from the NULL pointer dereference

How to detect it

Review kernel logs for oops or panic messages referencing drm/amd/display and NULL dereference during power management or hibernate events; correlate with system suspend attempts on affected hardware.

What your security team should do

• Prioritize kernel upgrades on all AMD GPU Linux systems within the next maintenance window
• Monitor EPSS and exploit maturity indicators for any increase in risk
• Restrict unprivileged local access where feasible until patches are applied
• Test hibernation behavior in a lab environment after patching