CVE-2025-61663 Grub2: missing unregister call for normal commands may lead to use-after-free

Description

A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.

Exploitable with local access to the machine, without an account and without any user action; the impact on data or service is limited.

Attack vector

Local

Attack complexity

High

Privileges required

None

Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected products and versions