IBM i is IBM’s integrated operating system for Power Systems. It is built around a strong authority model, where users, jobs, and applications are granted precise rights over objects, libraries, and files. The platform also uses the Integrated File System (IFS) for hierarchical file access, so security depends on both object authority and file permissions being configured correctly.
In cyber security, IBM i matters because many attacks do not need remote code execution to cause damage. If an authenticated local account can modify files it should not touch, an attacker may corrupt configurations, alter scripts, disrupt batch jobs, or influence privileged processes that later consume those files. Defenders focus on patching IBM i promptly, reviewing who can write to sensitive IFS paths, and monitoring for unexpected file changes. On IBM i, integrity failures are often the first sign of a larger compromise risk.