CVE-2022-28736 (grub2)

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.

boot code command control cve data exposed free function grub2 may memory memory allocation operating systems sensitive data support systems use-after-free vulnerability