CVE-2024-42064

What it actually does

Improper validation of pipe index in AMD display driver allows kernel to dereference or operate on an unset pipe structure, triggering a crash.

Why it matters to the business

Linux systems with AMD GPUs may experience sudden kernel panics or display subsystem failures, causing unplanned downtime and loss of graphical sessions.

How an attack unfolds

A local user crafts or triggers display configuration changes that leave a pipe index uninitialized; the driver then attempts to use the invalid index without checking, resulting in a crash.

How to fix it

Update the Linux kernel to a version containing commit 27df59c6071470efce7182ee92fbb16afba551e0 or later stable releases that include the pipe index validation skip.

How to confirm the fix worked

Verify the running kernel contains commit 27df59c6071470efce7182ee92fbb16afba551e0; test display initialization under load to confirm no crash on unset pipe indices.

Typical attack path

1. Obtain local user access on affected Linux system
2. Trigger AMD display pipe configuration via graphics API or display settings
3. Supply malformed or incomplete pipe index data
4. Driver skips validation and dereferences invalid pipe
5. Kernel panics or display subsystem aborts

How to detect it

Review kernel logs for AMD display driver oops or panic messages referencing pipe index handling around the time of display configuration changes.

What your security team should do

• Prioritize kernel updates on all AMD GPU hosts within normal change windows
• Monitor vendor advisories for backported fixes in distribution kernels
• Restrict unprivileged access to graphics configuration interfaces where feasible