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CVE-2021-47560

mlxsw: spectrum: Protect driver from buggy firmware

MEDIUM
5.5
CVSS Score
Published: May 24, 2024 at 03:12 PM UTC
Updated: June 17, 2026 at 04:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.11 ≤ v < 5.15.65.4 ≤ v < 5.10.835.4 ≤ v < 5.15.65.4 ≤ v < 5.1628b1987ef5064dd5c43538ba1168ef7b801f3cad5.16 rc15.16 rc2
Vendor states this is fixed in 63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047 (fixed)
Vendor states this is fixed in 90d0736876c50ecde1a3275636a06b9ddb1cace9 (fixed)
Vendor states this is fixed in da4d70199e5d82da664a80077508d6c18f5e76df (fixed)
Vendor states this is fixed in 5.10.83 (unaffected)
Vendor states this is fixed in 5.15.6 (unaffected)
Vendor states this is fixed in 5.16 (unaffected)
Vendor states this is fixed in 5.4 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/90d0736876c50ecde1a3275636a06b9ddb1cace9
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/da4d70199e5d82da664a80077508d6c18f5e76df

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-476

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