CVE-2022-28736

There’s a use-after-free vulnerability in grub_cmd_chainloader() function;
The chainloader command is used to boot up operating systems that doesn’t
support multiboot and do not have direct support from GRUB2. When executing
chainloader more than once a use-after-free vulnerability is triggered. If
an attacker can control the GRUB2’s memory allocation pattern sensitive
data may be exposed and arbitrary code execution can be achieved.