Linux is the most popular open-source operating system based on the Linux kernel, developed by Linus Torvalds. Linux is a freely distributable, multi-tasking, multi-user UNIX operating system derivative. Linux has become a much more popular and more used operating system today than before. All these developments have caused Linux servers to be among the primary targets of cybercriminals. We talked with Nikos Mavrogiannopoulos about Linux and security.