Lynis Security Controls

AUTH-9222 - Unique authentication groups


Groups should be unique to ensure each user has the appropriate permissions.



How to solve

Perform a check on your group files (/etc/group and /etc/gshadow) for any double group references. Usually this indicates a typo or incorrect usage of group IDs.

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Linux and Unix System Hardening

This information is provided as part of the Lynis community project. It is related to Lynis control AUTH-9222. All information should be considered as-is, without guarantees. Any advice or snippets should be tested before implementing in production environments.


Lynis is a technical security audit tool for Unix flavors like Linux, macOS, AIX, Solaris, and *BSD. It is open source software and free to use. The project has an active community, including open development via GitHub.

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