CVE-2023-52657

What it actually does

The reverted commit leaves AMD SI Oland GPUs in a state where enabling the display controller triggers kernel hangs, while driver unload during reboot or power-off produces errors that prevent clean shutdown.

Why it matters to the business

Systems using affected AMD hardware experience unexpected freezes and failed restarts, increasing unplanned downtime and requiring manual intervention or hardware resets.

How an attack unfolds

An attacker with local access loads or unloads the amdgpu driver, toggles display output, or initiates a reboot on an SI Oland system; the power-management paths introduced by the original commit then cause the kernel to hang or log fatal errors.

How to fix it

Upgrade the Linux kernel to a fixed release such as 6.1.81 or later stable trees containing commit 2e443ed55fe3ffb08327b331a9f45e9382413c94; rebuild and reboot with the corrected amdgpu driver.

How to confirm the fix worked

Confirm the running kernel contains the revert commit, then exercise display initialization and multiple reboot cycles while monitoring dmesg for absence of SI-related hangs or power-off errors.

Typical attack path

1. Obtain local execution on a Linux system with an affected AMD SI GPU
2. Trigger amdgpu driver initialization with DC enabled or issue a controlled reboot
3. Observe kernel hang or repeated errors during power-off sequence
4. Deny service until manual power cycle or kernel panic recovery

How to detect it

Review kernel logs (dmesg, journalctl) around driver load, display enablement, and shutdown events for repeated amdgpu errors or hung task warnings on SI hardware; correlate with uptime anomalies or forced power cycles.

What your security team should do

• Prioritize kernel updates on all systems exposing AMD SI hardware within the next maintenance window
• Add kernel version checks to asset inventory and block deployment of unpatched images
• Test reboot and display paths in staging environments before wide rollout