No, I am on Tumbleweed and I am not the only one with this problem.

Look at the link in the post from Andrei Borzenkov . [ Thanx! ]

Problem still not solved.

Temporary workaround: Start Kernel 5.12 as default.

On Sat, Jul 10, 2021 at 7:57 PM James Knott <james.knott@jknott.net> wrote:

I have kernel-default-5.3.18-59.10.1.x86_64 and it runs VirtualBox
without problem.

You have 5.3 not 5.13. You are on leap 15.2 not tumbleweed.