CVE-2024-27044

What it actually does

The dcn10_set_output_transfer_func() function dereferences the 'stream' pointer before performing a NULL check, enabling a potential NULL pointer dereference in the AMD display hardware sequencing code path.

Why it matters to the business

Systems using affected AMD GPUs on Linux kernels may experience display driver instability or kernel crashes during graphics operations, leading to system reboots, loss of display output, and degraded workstation or server availability until patched kernels are deployed.

How an attack unfolds

An attacker with local access triggers the vulnerable function through graphics or display configuration changes that cause the 'stream' pointer to be NULL when dereferenced, resulting in a kernel panic; no public exploit code or threat actor campaigns are associated with this issue.

How to fix it

Update the Linux kernel to a version containing commit e019d87e02f1e539ae48b99187f253847744ca7a or later; rebuild and deploy the fixed kernel across affected systems.

How to confirm the fix worked

Confirm the running kernel contains commit e019d87e02f1e539ae48b99187f253847744ca7a by inspecting git log or kernel version strings; review dcn10_hwseq.c around line 1892 to verify the NULL check precedes pointer use.

Typical attack path

1. Obtain local user access on a Linux system with vulnerable AMD display hardware
2. Trigger display or graphics operations that invoke dcn10_set_output_transfer_func() with a NULL stream pointer
3. Cause kernel dereference of the NULL pointer leading to panic or crash

How to detect it

Review kernel logs for oops or panic entries referencing dcn10_set_output_transfer_func or dcn10_hwseq.c; no known in-the-wild exploitation indicators exist.

What your security team should do

• Prioritize kernel updates on all systems with AMD display hardware within standard change windows
• Monitor for kernel oops or panic logs related to amdgpu or dcn10_hwseq
• Test patched kernels in staging environments before broad rollout