CVE-2023-52862

What it actually does

Null pointer dereference occurs in the AMD display core error logging path when attempting to print an undefined DC version number after initialization failure.

Why it matters to the business

AMD GPU systems running affected kernels may crash or become unstable during display initialization errors, causing downtime or denial of service on Linux servers and workstations.

How an attack unfolds

An attacker triggers a Display Core initialization failure on an AMD system, after which the kernel dereferences a null pointer while formatting the error message, resulting in a crash.

How to fix it

Update the Linux kernel to include commit 97ef07182ac46b069bb5e7d46cb903a764d67898 or later stable versions containing the fix.

How to confirm the fix worked

Verify the presence of the fix commit in the kernel source; test DC initialization failure scenarios to confirm absence of null dereference.

Typical attack path

1. Cause DC initialization to fail on target AMD hardware
2. Trigger the error message formatting code path
3. Induce null pointer dereference leading to kernel panic

How to detect it

Review kernel panic and oops logs for AMD display core or DC initialization failure messages around the time of system instability.

What your security team should do

• Prioritize kernel updates on all AMD GPU systems
• Monitor kernel logs for display initialization failures
• Test patched kernels in staging environments before broad deployment