CVE-2024-50160

What it actually does

NULL pointer dereference occurs in ALSA hda/cs8409 dolphin_fixups when snd_hda_gen_add_kctl allocation fails and returns NULL without subsequent check before use.

Why it matters to the business

System instability or crash on affected Linux audio hardware configurations can interrupt operations and require restarts, with limited downstream dependents reducing widespread exposure.

How an attack unfolds

An attacker with local access triggers the hda_fixup path in dolphin_fixups under memory pressure to force allocation failure, causing the unchecked NULL dereference and resulting kernel fault; listed threat actors have targeted similar Linux kernel memory issues in espionage and financial campaigns.

How to fix it

Update to fixed kernel versions addressing the NULL check; for listed Ubuntu packages apply the referenced firefox updates if applicable in mixed environments, though primary fix is in ALSA driver code.

How to confirm the fix worked

Confirm kernel source includes the added NULL check before dereference in dolphin_fixups and test allocation failure paths do not panic.

Typical attack path

1. Obtain local access to target system
2. Trigger ALSA HDA codec initialization under constrained memory conditions
3. Force snd_hda_gen_add_kctl to return NULL
4. Execute dolphin_fixups leading to NULL dereference and kernel panic

How to detect it

Review kernel logs for NULL dereference oops in hda/cs8409 or dolphin_fixups paths; correlate with threat actor patterns around Linux kernel resource and bounds issues.

What your security team should do

• Prioritize patching affected Linux kernel packages due to memory corruption family
• Monitor EPSS trend stability and absence from KEV for scheduling
• Audit audio driver usage on production systems for exposure