NULL Pointer Dereference Affecting kernel-64k-modules package, versions <0:5.14.0-284.11.1.el9_2


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-RHEL9-KERNEL64KMODULES-8165020
  • published8 Oct 2024
  • disclosed24 May 2024

Introduced: 24 May 2024

CVE-2021-47560  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade RHEL:9 kernel-64k-modules to version 0:5.14.0-284.11.1.el9_2 or higher.
This issue was patched in RHSA-2023:2458.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules package and not the kernel-64k-modules package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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.

CVSS Scores

version 3.1