tl;dr: This can permanently brick some/many/all? UEFI devices. Three cases confirmed so far on Lenovo/MSI/unknown hardware. Linux distribution other than Arch

tl;dr: This can permanently brick some/many/all? UEFI devices. Three cases confirmed so far on Lenovo/MSI/unknown hardware. Linux distribution other than Arch are likely to be affected as well because systemd is hardcoded to mount the EFI variables pseudo-filesystem with RW access on every boot.