The GRUB (GNU GRand Unified Bootloader) is a boot loader used by Linux and other Unix-like operating systems. The gettext module in GRUB handles internationalization and localization. A Use-After-Free vulnerability has been discovered in this module, which can cause the application to access a memory location that is no longer valid. This can lead to a Denial of Service (DoS) or potentially more severe issues if an attacker exploits it.
You're affected if you use GRUB versions 2.06 and earlier. To check if your system uses GRUB, run the command grub --version in your terminal.
To fix this vulnerability, update to a newer version of GRUB. You can download the latest version from the official GNU website: https://www.gnu.org/software/grub/. Alternatively, you can use the following command to upgrade your system:
sudo apt-get update && sudo apt-get install grub-updater
For RPM-based systems (e.g., Fedora):
sudo dnf update && sudo dnf install grub2
For Debian-based systems (e.g., Ubuntu):
sudo apt-get update && sudo apt-get install grub