What’s Vulnerable › Vulnerabilities

CVE-2021-47560: mlxsw: spectrum: Protect driver from buggy firmware

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-24 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 5.4 before 5.10.83; from 5.11 before 5.15.6; 5.16-rc1, 5.16-rc2 — fixed in 5.10.83, 5.15.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.83, 5.15.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047
• https://git.kernel.org/stable/c/90d0736876c50ecde1a3275636a06b9ddb1cace9
• https://git.kernel.org/stable/c/da4d70199e5d82da664a80077508d6c18f5e76df
• https://git.kernel.org/stable/c/63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047
• https://git.kernel.org/stable/c/90d0736876c50ecde1a3275636a06b9ddb1cace9
• https://git.kernel.org/stable/c/da4d70199e5d82da664a80077508d6c18f5e76df

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