CVE-2022-28736: GNU GRUB2

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• GNU GRUB2: from 2.00, before 2.06-3 (fixed in 2.06-3)

Published 2023-07-20. Last modified 2026-06-17.