CVE-2021-47560: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum: Protect driver from buggy firmware When processing port up/down events generated by the device's firmware, the driver protects itself from events reported for non-existent local ports, but not the CPU port (local port 0), which exists, but lacks a netdev. This can result in a NULL pointer dereference when calling netif_carrier_{on,off}(). Fix this by bailing early when processing an event reported for the CPU port. Problem was only observed when running on top of a buggy emulator.

Affected products

• Linux Linux Kernel: from 5.4, before 5.10.83 (fixed in 5.10.83); from 5.11, before 5.15.6 (fixed in 5.15.6); version 5.16 only

Published 2024-05-24. Last modified 2026-06-17.