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Linux Kernel LAN78XX USB Driver NAPI Management Warning Fix

Vulnerability

A warning issue in the Linux kernel's USB LAN78XX driver has been addressed. During the disconnection of a USB device, a warning can be triggered because the NAPI (Network Active Polling Interface) is still enabled. The redundant call to remove the NAPI interface has been eliminated, as the network device unregistration process will automatically handle the NAPI teardown. This change prevents the warning from occurring.

Impact

The vulnerability could lead to unnecessary warning messages being generated during USB device disconnection, which could potentially be misinterpreted as a more serious issue.

Reproduction

The warning can be reproduced by disconnecting a USB device that uses the LAN78XX driver while NAPI is still enabled. This will trigger a warning in the kernel log about the NAPI interface not being properly removed before the disconnection.

Remediation

Users can upgrade to the latest version of the Linux kernel where this issue has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.

Added: May 13, 2026, 5:34 PM
Updated: May 13, 2026, 5:34 PM

Vulnerability Rating

Custom Algorithm
spread
9.0
impact
0.6
exploitability
2.5
remediation
7.7
relevance
8.2
threat
4.8
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.