It’s a wild assumption to claim “All bugs in the Linux kernel are security issues”, without any backing, whoever is making that claim needs to provide evidence since the default position for any program is that there are bugs that are not security issues.
There are lots of things the Kernel controls that can have non security related bugs, e.g. controller with the wrong mapping https://github.com/torvalds/linux/commit/9131f8cc2b4eaf7c08d402243429e0bfba9aa0d6
It’s a wild assumption to claim “All bugs in the Linux kernel are security issues”, without any backing, whoever is making that claim needs to provide evidence since the default position for any program is that there are bugs that are not security issues.