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Security vulnerabilities in the Linux Kernel cls_tcindex driver

This document (000021588) is provided subject to the disclaimer at the end of this document.

Environment

Situation

The Linux Kernel cls_tcindex driver has multiple security issues that are hard to fix. Also there is a very small amount of users.
SUSE has blacklisted the cls_tcindex module from loading the module to remove this attack surface.

Resolution

The blacklisting is achieved by this  line:

/lib/modprobe.d/50-blacklist-netcls.conf:blacklist cls_tcindex

If the module is loaded manually by the administrator, it likely is exploitable by local users.

If the module should be loaded automatically again, please comment / remove above line or remove the /lib/modprobe.d/50-blacklist-netcls.conf file.

SUSE Linux Enterprise Server 15 SP6 and newer kernels no longer include cls_tcindex and SUSE is not planning to backport future security fixes for cls_tcindex at this time.

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:000021588
  • Creation Date: 18-Oct-2024
  • Modified Date:18-Oct-2024
    • SUSE Linux Enterprise Desktop
    • SUSE Linux Enterprise Server
    • SUSE Linux Enterprise Server for SAP Applications
    • SUSE Manager Server
    • SUSE Linux Enterprise Micro

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