Linux on a satellite bus is definitely up and coming. For example ESA's OPS-SAT ran the NanoSat MO Framework (https://nanosat-mo-framework.github.io/), written in Java and running on an ARM Linux OBC. It also makes a lot of sense for payload computers.
I'm working on a Linux distribution for space applications that addresses some of the pain points (application deployment, software update & memory-safe implementations of typical space protocols like CCSDS/PUS). If all goes to plan it will fly on a 1U CubeSat tech demonstrator this year, a cybersecurity research 1U CubeSat next year, and a 2U high performance satellite ... later. :)
I'm working on a Linux distribution for space applications that addresses some of the pain points (application deployment, software update & memory-safe implementations of typical space protocols like CCSDS/PUS). If all goes to plan it will fly on a 1U CubeSat tech demonstrator this year, a cybersecurity research 1U CubeSat next year, and a 2U high performance satellite ... later. :)