The interest is warranted, but it was been true for a long time that the kernel spawns processes where the executable is in the kernel itself.

https://www.quora.com/What-is-kswapd0-in-Linux-Kernel

https://stackoverflow.com/questions/9154042/where-can-i-find...

Here's some official documentation on it:

https://tldp.org/HOWTO/From-PowerUp-To-Bash-Prompt-HOWTO-8.h...