CVE-2024-23196

What it actually does

Race condition in snd_hdac_regmap_sync leads to null pointer dereference causing kernel panic or denial of service.

Why it matters to the business

Local denial of service that can crash affected systems, disrupting operations with low likelihood of remote exploitation.

How an attack unfolds

An attacker with local access triggers the race condition in the sound driver to dereference a null pointer and panic the kernel.

How to fix it

Update affected systems to a fixed kernel version; for craftcms/cms apply commit 7c790fa5ad5a8cb8016cb6793ec3554c4c079e38.

How to confirm the fix worked

Verify kernel version or commit hash after update and test for absence of the race condition under load.

Typical attack path

1. Obtain local access to a vulnerable system
2. Trigger concurrent operations in the HDA driver to hit the race
3. Cause null pointer dereference resulting in kernel panic

How to detect it

Review kernel logs for null pointer dereference panics in sound/hda paths and correlate with user activity around snd_hdac_regmap_sync.

What your security team should do

• Apply the listed fixed commit or kernel update immediately
• Monitor for local privilege abuse that could trigger the flaw
• Limit local access where possible until patched