CVE-2024-46723

What it actually does

Potential out-of-bounds read when accessing the ucode array during microcode loading in the AMD GPU driver without proper bounds validation.

Why it matters to the business

Kernel-level memory corruption risk on systems with AMD GPUs could lead to crashes, data exposure, or privilege escalation; high prevalence in Linux distributions increases exposure across servers and workstations, though low exploit likelihood reduces immediate urgency.

How an attack unfolds

An attacker with local access crafts input that triggers the ucode read path in the amdgpu driver, bypassing bounds checks to read adjacent kernel memory; listed threat actors in kernel memory issues suggest possible use in targeted campaigns but no confirmed active exploitation for this specific flaw.

How to fix it

Update the Linux kernel to a version containing commit 82ac8f1d02886b5d8aeb9e058989d3bd6fc581e2 or later stable releases that include the bounds fix for the ucode access.

How to confirm the fix worked

Verify the presence of commit 82ac8f1d02886b5d8aeb9e058989d3bd6fc581e2 in the kernel source or running kernel version; test amdgpu initialization with boundary ucode cases to confirm no warning or read violation occurs.

Typical attack path

1. Obtain local code execution or user access on a Linux system with AMD GPU
2. Trigger the amdgpu microcode loading code path with crafted or malformed ucode data
3. Exploit missing bounds check to perform out-of-bounds read
4. Leverage read data for further kernel attacks or information disclosure

How to detect it

Review kernel logs for amdgpu-related warnings or oops during driver initialization; inspect for unusual memory access patterns around microcode loading in forensic memory captures or audit logs.

What your security team should do

• Prioritize kernel updates on all AMD GPU-equipped Linux systems within standard patch cycles
• Monitor EPSS and KEV updates for any rise in exploit activity
• Restrict unprivileged local access where possible until patched