CVE-2022-2601

A buffer overflow was found in grub_font_construct_glyph(). A malicious
crafted pf2 font can lead to an overflow when calculating the
max_glyph_size value, allocating a smaller than needed buffer for the
glyph, this further leads to a buffer overflow and a heap based
out-of-bounds write. An attacker may use this vulnerability to circumvent
the secure boot mechanism.

Bugs

• <https://bugs.launchpad.net/ubuntu/+source/grub2-unsigned/+bug/1996950&gt;