CVE-2023-4001: Fedoraproject Fedora

Medium severity, CVSS 6.8. EPSS: 0.5% chance of exploitation in the next 30 days.

An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the "/boot/" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.

Affected products

• Fedoraproject Fedora: version 38 only; version 39 only
• GNU GRUB2: affected versions not specified
• Red Hat Enterprise Linux: version 9.0 only

Published 2024-01-15. Last modified 2026-06-17.