CVE-2024-56784

What it actually does

Missing bounds check on array indices in the AMD display driver allows out-of-bounds memory access, resulting in memory corruption.

Why it matters to the business

Systems may experience crashes, data loss, or unauthorized code execution; high prevalence of the affected driver increases exposure across Linux deployments.

How an attack unfolds

An attacker supplies crafted display parameters that exceed expected array limits, triggering uncontrolled memory writes that can be leveraged for privilege escalation or denial of service.

How to fix it

Update the Linux kernel to a version containing the array index validation; for the listed chromium-browser packages on Ubuntu 14.04 LTS apply version 53.0.2785.143-0ubuntu0.14.04.1.1142 or later.

How to confirm the fix worked

Confirm the installed kernel or chromium-browser package version meets or exceeds the listed fixed releases and verify the presence of the added bounds-check logic in the drm/amd/display source.

Typical attack path

1. Identify a system using the vulnerable AMD display driver
2. Craft and deliver display configuration or mode data that exceeds array bounds
3. Trigger the out-of-bounds access to corrupt adjacent memory structures
4. Leverage the corruption to execute arbitrary code or crash the system

How to detect it

Review system and kernel logs for unexpected crashes or corruption warnings in the AMD display driver path; examine any exploit artifacts that attempt to manipulate display mode or timing parameters.

What your security team should do

• Apply the kernel or chromium-browser update immediately on all affected hosts
• Prioritize systems with AMD GPUs given the driver location
• Monitor for post-patch stability issues during display mode changes