Originally reported for RedHat/CentOS, seems to affect Ubuntu, Debian and Fedora as well. Can confirm that my Fedora Server did not come back after the update+reboot cycle of today. Debian and Ubuntu servers have the update installed, but are not configured to restart automatically, so they are still working:

https://arstechnica.com/gadgets/2020/07/red-hat-and-centos-systems-arent-boo...

Kind regards, Alberto Abrao