grub2: Use-after-free redefining a function whilst the same function is already executing

GRUB2 contains a race condition in grubscriptfunctioncreate leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2...

PT-2020-3624

Name of the Vulnerable Software and Affected Versions GRUB2 versions prior to 2.04 Description The issue is related to a race condition in the grub script function create function of the Grub2 bootloader, which can lead to a use-after-free condition when a function is redefined while it is alread...