In libXfont before 1.5.4 and libXfont2 before 2.0.3, a local attacker can open (but not read) files on the system as root, triggering tape rewinds, watchdogs, or similar mechanisms that can be triggered by opening files.
https://bugzilla.suse.com/show_bug.cgi?id=1050459
https://lists.debian.org/debian-lts-announce/2022/01/msg00028.html
https://marc.info/?l=freedesktop-xorg-announce&m=151188044218304&w=2
https://marc.info/?l=freedesktop-xorg-announce&m=151188049718337&w=2
https://security.gentoo.org/glsa/201801-10