CVE-2024-27029

What it actually does

Out-of-bounds access when handling mmhub client identifier 0x140 in the AMD GPU driver, allowing memory corruption in kernel space.

Why it matters to the business

System instability, crashes, or potential privilege escalation on Linux systems using AMD GPUs, increasing downtime and support costs for organizations with affected hardware.

How an attack unfolds

An attacker triggers graphics operations that supply an unhandled client identifier value to the mmhub handling code, resulting in invalid memory access that can be leveraged for corruption or denial of service.

How to fix it

Update the Linux kernel to a version containing commit e1e076bda4fd6378ae650f2c6ef1a4ff93c5aea5 or later stable release that properly bounds-checks the mmhub client identifier.

How to confirm the fix worked

Confirm kernel source includes the bounds check for cid 0x140 in amdgpu mmhub code and test graphics initialization and heavy workloads on AMD hardware for stability.

Typical attack path

1. Identify target system with vulnerable AMD GPU driver
2. Craft or trigger graphics workload that passes cid 0x140 to mmhub client handling
3. Cause out-of-bounds memory read or write in kernel context
4. Escalate to kernel crash or memory corruption for further exploitation

How to detect it

Review kernel logs for amdgpu driver crashes or oops messages referencing mmhub client identifiers; correlate with graphics application launches on AMD hardware.

What your security team should do

• Prioritize kernel updates on all AMD GPU-equipped Linux systems
• Monitor vendor advisories for backported fixes in distribution kernels
• Restrict untrusted graphics workloads until patched