CVE-2022-0854

What it actually does

Memory leak in the Linux kernel DMA subsystem triggered by DMA_FROM_DEVICE calls allows a local user to read arbitrary kernel memory.

Why it matters to the business

Local attackers can extract sensitive kernel data from Linux systems, potentially exposing credentials or enabling further attacks; high prevalence in servers and devices increases exposure.

How an attack unfolds

An attacker with local access on a vulnerable Linux kernel invokes DMA_FROM_DEVICE operations to trigger the memory leak and read kernel memory contents.

How to fix it

Upgrade the Linux kernel to a version containing the fix for the DMA subsystem memory leak; apply vendor patches as they become available.

How to confirm the fix worked

Confirm the running kernel version includes the DMA leak fix and test that DMA_FROM_DEVICE operations no longer expose kernel memory.

Typical attack path

1. Gain local user access on the target Linux system
2. Craft and execute calls to the vulnerable DMA_FROM_DEVICE interface
3. Read and parse the leaked kernel memory for sensitive information

How to detect it

Review kernel logs and audit records for unusual DMA subsystem calls or repeated DMA_FROM_DEVICE invocations; correlate with known Linux kernel exploitation patterns from threat actors.

What your security team should do

• Prioritize kernel updates on all affected Linux systems due to public exploit availability
• Limit local access and user privileges to reduce attack surface
• Monitor kernel logs for anomalous DMA activity