More recently there was "rm -rf /" wiping efivars and bricking some motherboards with shitty uefi implementations thanks to systemd mounting efivars rw by default (and shitty motherboard firmware). The kernel "fixed" this by mounting unknown efivars as (mostly) immutable.
https://www.phoronix.com/news/UEFI-rm-root-directory
https://www.kernel.org/doc/html/latest/filesystems/efivarfs....