NULL Pointer Dereference Affecting kernel-modules package, versions <0:4.18.0-477.75.1.el8_8
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Test your applications- Snyk ID SNYK-RHEL8-KERNELMODULES-8188429
- published 15 Oct 2024
- disclosed 24 May 2024
Introduced: 24 May 2024
CVE-2021-47560 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-modules to version 0:4.18.0-477.75.1.el8_8 or higher.
This issue was patched in RHSA-2024:8107.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-modules package and not the kernel-modules package as distributed by RHEL.
See How to fix? for RHEL:8 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.