CVE-2024-46817

What it actually does

The flaw triggers a potential buffer overrun during amdgpu_dm initialization in the Linux kernel DRM/AMD display driver when the number of active streams exceeds six; the code was updated to return failure and abort initialization instead of proceeding with an invalid stream count.

Why it matters to the business

Organizations running affected Linux kernels on AMD GPUs risk system instability or crashes under multi-display workloads, increasing downtime and requiring urgent kernel updates across fleets with high downstream package counts.

How an attack unfolds

An attacker with local access configures a display setup exceeding six simultaneous streams to trigger the unhandled overrun condition during driver initialization, potentially leading to memory corruption that could be leveraged for privilege escalation or denial of service, consistent with observed Linux kernel exploitation patterns by espionage and financially motivated actors.

How to fix it

Update the Linux kernel to the fixed commit d619b91d3c4af60ac422f1763ce53d721fb91262 or later stable releases containing the abort logic for stream counts greater than six.

How to confirm the fix worked

Confirm the running kernel contains commit d619b91d3c4af60ac422f1763ce53d721fb91262, then test initialization with stream counts above six to verify early failure return instead of proceeding.

Typical attack path

1. Obtain local access to a system with an affected AMD GPU and kernel
2. Force or configure more than six concurrent display streams
3. Trigger amdgpu_dm initialization path
4. Exploit resulting memory overrun for code execution or crash

How to detect it

Review kernel logs for amdgpu_dm initialization failures or stream count warnings around display hotplug events; correlate with process activity creating excessive display outputs.

What your security team should do

• Prioritize kernel upgrades on all AMD GPU systems within the next patching cycle
• Monitor for display-related kernel oops or Coverity-style warnings in logs
• Limit multi-monitor configurations exceeding six streams until patched