Fedora considers deprecating legacy BIOS

> which is vulnerability within systemd and only happens on UEFI hardware.

The vulnerability is actually with networkd-dispatcher, which is developed (and distributed!) independently from systemd. It's not even widely packaged in distributions! It's not a "systemd vulnerability" any more than a vulnerability in NetworkManager or Apache (or any other random daemon) can be called a "systemd vulnerability."

Meanwhile I see nothing in the article about how this vulnerability can only affect UEFI systems -- it seems to involve relatively run-of-the-mill symlink traversal, and the CVE descriptions are still redacted. Can you point us towards some sort of supporting evidence for your assertion?