CVE-2024-53199

What it actually does

Missing NULL check on devm_kasprintf() return value in imx_audmix_probe allows kernel NULL pointer dereference on allocation failure.

Why it matters to the business

Systems using the affected audio driver may experience crashes or denial of service under memory pressure, disrupting audio functionality on embedded hardware with low operational impact given the low exploitability.

How an attack unfolds

An attacker would need local access and the ability to induce memory exhaustion during driver probe to trigger the unchecked NULL return, leading to a kernel dereference and potential crash; no public exploits or ransomware use reported despite mentions of broad Linux kernel campaigns by espionage and financially motivated actors.

How to fix it

Apply the kernel patch adding the NULL check in imx_audmix_probe; for listed packages update flashplugin-nonfree on Ubuntu 14.04 LTS to 11.2.202.632ubuntu0.14.04.1.

How to confirm the fix worked

Inspect source for the added NULL check after devm_kasprintf, review kernel logs for absence of related oops messages, and confirm package versions match fixed releases.

Typical attack path

1. Gain local access to target system
2. Trigger imx_audmix_probe under memory-constrained conditions
3. Cause NULL pointer dereference resulting in kernel panic

How to detect it

Search kernel logs and oops reports for references to imx_audmix_probe and NULL pointer dereference; correlate with low-memory events during driver initialization.

What your security team should do

• Prioritize kernel updates on affected embedded Linux systems
• Monitor kernel logs for NULL dereference indicators in audio drivers
• Assess exposure only on hardware using imx-audmix