Riskcovery

CVE-2021-47560

mlxsw: spectrum: Protect driver from buggy firmware

State
Published
Severity
Not scored
Published
May 24, 2024
Updated
May 11, 2026
Reserved
May 24, 2024

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 28b1987ef5064dd5c43538ba1168ef7b801f3cad to before 90d0736876c50ecde1a3275636a06b9ddb1cace9Affected
  • 28b1987ef5064dd5c43538ba1168ef7b801f3cad to before da4d70199e5d82da664a80077508d6c18f5e76dfAffected
  • 28b1987ef5064dd5c43538ba1168ef7b801f3cad to before 63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047Affected
LinuxLinux
  • 5.4Affected
  • before 5.4Not affected
  • 5.10.83 through 5.10.*Not affected
  • 5.15.6 through 5.15.*Not affected
  • 5.16 and laterNot affected

References

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