CVE-2021-47560

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= 28b1987ef5064dd5c43538ba1168ef7b801f3cad, < 90d0736876c50ecde1a3275636a06b9ddb1cace9; >= 28b1987ef5064dd5c43538ba1168ef7b801f3cad, < da4d70199e5d82da664a80077508d6c18f5e76df; >= 28b1987ef5064dd5c43538ba1168ef7b801f3cad, < 63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047
LinuxLinux5.4

References

Timeline

Published
May 24, 2024
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2021-47560: Medium severity, CVSS 5.5 | Vulnix