CVE-2024-46726

What it actually does

The flaw allows index calculations for vmid0p72_idx, vnom0p8_idx, and vmax0p9_idx in the AMD display driver to overflow or exceed array bounds, resulting in three buffer overruns and one integer overflow.

Why it matters to the business

Unpatched Linux systems with affected AMD GPUs face elevated risk of kernel instability or memory corruption in the display subsystem, potentially leading to system crashes, degraded graphics performance, or local privilege escalation on servers and workstations.

How an attack unfolds

An attacker with local access crafts display configuration parameters that force the vulnerable index arithmetic to wrap or exceed bounds, triggering memory corruption that can be leveraged for code execution within the kernel context.

How to fix it

Update the Linux kernel to commit 733ae185502d30bbe79575167b6178cfb6c5d6bd or later stable releases containing the fix; for github.com/google/fscrypt update to version 0.3.3 or newer.

How to confirm the fix worked

Verify the running kernel contains commit 733ae185502d30bbe79575167b6178cfb6c5d6bd via git log or package version checks; recompile with Coverity or similar static analysis to confirm absence of the reported overrun and overflow defects.

Typical attack path

1. Obtain local user access on a vulnerable Linux system
2. Trigger AMD display driver code paths involving voltage or mode index calculations
3. Supply crafted parameters that cause integer overflow during index computation
4. Exploit resulting buffer overrun for kernel memory corruption or control-flow hijacking

How to detect it

Review kernel crash logs and dmesg for display driver oops or panic entries around index calculations; inspect audit logs for unusual local process activity targeting AMD display interfaces.

What your security team should do

• Prioritize kernel upgrades on all AMD GPU-equipped Linux hosts within 30 days
• Monitor vendor advisories for backported patches in distribution kernels
• Apply least-privilege controls to limit local access on graphics-enabled systems