Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-47560

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
24/05/2024
Last modified:
06/01/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mlxsw: spectrum: Protect driver from buggy firmware<br /> <br /> When processing port up/down events generated by the device&amp;#39;s firmware,<br /> the driver protects itself from events reported for non-existent local<br /> ports, but not the CPU port (local port 0), which exists, but lacks a<br /> netdev.<br /> <br /> This can result in a NULL pointer dereference when calling<br /> netif_carrier_{on,off}().<br /> <br /> Fix this by bailing early when processing an event reported for the CPU<br /> port. Problem was only observed when running on top of a buggy emulator.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.4 (including) 5.10.83 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.6 (excluding)
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools