Linux is inherently not a secure operating system. The reason it's not secure is because Linux was based on the architectural design of UNIX, and the creators of UNIX didn't care about security – it was 1969 after all.
"The first fact to face is that UNIX was not developed with security, in any realistic sense, in mind; this fact alone guarantees a vast number of holes," Dennis Ritchie wrote in his paper, "On the Security of UNIX" in 1979.
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