[agilob]

This is a single example of an unsuccessful attempt to backdoor Linux. There were successful attempts too https://www.bleepingcomputer.com/news/security/nsa-linked-bv...

[grugq]

Am I missing something? That seems to link to a Linux backdoor, not a backdoor in Linux.

[deelowe]

Yeah. This doesn't appear to be the same sort of thing (malicious code being integrated into the kernel itself). This is just a backdoor that leverages an exploit.