CVE-2022-3594

What it actually does

The flaw in the intr_callback function of drivers/net/usb/r8152.c causes excessive data to be logged when triggered, enabling remote attackers to induce log flooding that consumes resources and results in limited denial of service.

Why it matters to the business

Systems using affected Linux kernels with Realtek USB Ethernet adapters may experience performance degradation or instability from log volume, increasing operational overhead for affected deployments until patched.

How an attack unfolds

An attacker sends network traffic that reaches the USB network device driver, repeatedly invoking the callback with conditions that generate large log entries, exhausting disk space or I/O capacity over time.

How to fix it

Update the Linux kernel to include commit 830b3c68c1fb1e9176028d02ef86f3cf76aa2476 or later; rebuild and deploy the patched kernel across affected systems, then reboot.

How to confirm the fix worked

Verify kernel source or binary contains the referenced commit hash; test that log volume from r8152 no longer spikes under the previously triggering conditions.

Typical attack path

1. Identify remote Linux systems exposing or using r8152-based USB network interfaces
2. Craft and send packets or trigger conditions that invoke intr_callback with logging paths
3. Sustain traffic to produce excessive log output until resource exhaustion occurs

How to detect it

Review system and kernel logs for sudden high-volume entries originating from the r8152 driver; correlate with network activity on USB Ethernet interfaces and monitor for disk or I/O exhaustion indicators.

• intr_callback.*r8152
• excessive logging from drivers/net/usb/r8152.c

What your security team should do

• Prioritize kernel upgrades on all systems using r8152 USB Ethernet devices
• Monitor kernel log growth rates on exposed hosts until patches are applied
• Apply compensating controls such as log rate limiting where immediate updates are delayed