STIG, in the context of GNU/Linux, refers to the Security Technical Implementation Guide. It is a methodology for securing systems and networks that is developed by the United States Department of Defense. The STIGs provide technical guidance to secure information systems and software that might be vulnerable to a malicious cyber attack. They are used extensively by government agencies and other organizations to ensure that their systems comply with federal standards for security.
Specifically for GNU/Linux, a STIG would provide detailed instructions on how to secure various aspects of a Linux operating system. This might include settings for file permissions, user account management, network protocols, and other system configurations. The goal is to minimize vulnerabilities and reduce the risk of unauthorized access or data breaches.
STIGs are part of a broader set of policies and guidelines that fall under the Risk Management Framework (RMF) used by the U.S. federal government. The purpose of these guidelines is to help IT professionals implement cybersecurity measures in a systematic and reliable way, ensuring the security and integrity of their information systems.