CVE-2024-44977

What it actually does

Missing validation of TA binary size in the AMD GPU driver (drm/amdgpu) allows an out-of-bounds write when a crafted binary is loaded.

Why it matters to the business

Local attackers can corrupt kernel memory on affected systems, potentially gaining elevated privileges, executing arbitrary code, or causing denial of service; high ecosystem prevalence in Linux distributions increases exposure for organizations running AMD hardware.

How an attack unfolds

An attacker with local access supplies a malicious TA binary larger than expected to the AMD GPU driver initialization path, triggering the unvalidated size to overwrite adjacent kernel memory structures and achieve code execution or privilege escalation; observed in broader 2024 zero-day campaigns by espionage and financially motivated actors targeting Linux kernel memory issues.

How to fix it

Update the Linux kernel to a version containing commit 5ab8793b9a6cc059f503cbe6fe596f80765e0f19 or later stable releases; apply vendor backports for distributions; prioritize patching on systems with AMD GPUs given the local attack vector.

How to confirm the fix worked

Verify the running kernel contains the size-validation change in drm/amdgpu TA handling; inspect git history for commit 5ab8793b9a6cc059f503cbe6fe596f80765e0f19; test with known oversized TA binaries in a lab environment to confirm rejection.

Typical attack path

1. Obtain local user access on a Linux system with AMD GPU support
2. Craft or obtain a TA binary with oversized payload
3. Trigger driver loading or TA initialization via user-space interfaces
4. Exploit resulting OOB write for memory corruption and privilege escalation

How to detect it

Review kernel logs for TA binary loading errors or OOB-related warnings around driver initialization; correlate with process execution of graphics-related binaries; search for unexpected crashes or privilege changes following TA operations.

What your security team should do

• Apply kernel updates containing the referenced commit immediately on AMD GPU systems
• Monitor EPSS and threat actor activity for any increase in exploitation attempts
• Restrict unprivileged local access where possible until patches are deployed
• Include this class of driver validation flaws in future kernel hardening reviews