CVE-2024-26948

What it actually does

Missing NULL check on dc_state before release in AMD display driver allows invalid memory access or corruption during state cleanup.

Why it matters to the business

May cause kernel crashes, graphics instability, or potential code execution on Linux systems with AMD GPUs, leading to downtime and security exposure on servers, desktops, and embedded devices.

How an attack unfolds

An attacker with local access triggers display state transitions or graphics operations that pass a NULL dc_state to the release function, resulting in memory corruption that can be leveraged for privilege escalation.

How to fix it

Update Linux kernel to a version containing commit d37a08f840485995e3fb91dad95e441b9d28a269 which adds the NULL check in dc_state_release.

How to confirm the fix worked

Inspect kernel source for the NULL check in dc_state_release or confirm the running kernel includes the referenced commit via version or build inspection.

Typical attack path

1. Obtain local user access on target Linux system
2. Load or exercise AMD display driver code paths
3. Induce conditions causing NULL dc_state to reach release routine
4. Exploit resulting memory corruption for code execution

How to detect it

Review kernel logs for oops/panic entries mentioning dc_state_release or AMD display driver NULL dereference patterns around the time of suspected activity.

What your security team should do

• Apply kernel update containing the fix as soon as possible
• Prioritize systems with AMD graphics hardware
• Test display and graphics functionality after patching
• Monitor vendor kernel advisories for backported fixes