@Amelia Nope, as Linux developers themselves only claim that GPLv2-only applies to some parts and other parts
are under other licenses, despite how the whole lot legally needs to be under GPLv2 compatible terms.

Linux contains quite a few pieces of proprietary software, with only binaries provided (disguised as arrays of data) and no source
code.

One example is; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/platforms/8xx/micropatch.c but
there's plenty more.

That's right - it may not be possible to legally distribute the version of Linux from Mr. Torvalds without at least removing the
proprietary software within.

A few years back there was an attempt to move all of such proprietary software into "linux-firmware", where half the driver is in
Linux and the other half is in proprietary peripheral software, with both updated in lockstep (despite the massive derivative works
created), but such move isn't complete.

I personally prefer GNU's version of Linux myself; GNU Linux-libre; https://www.fsfla.org/ikiwiki/selibre/linux-libre/ which only
contains free software and which I'm confident is legal to distribute.