CVE-2025-61663 MEDIUM

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

Vendor Gnu
Product grub2
Weakness CWE-825
Published November 18, 2025
Last update December 19, 2025

CVSS base score

4.9/10
Attack vector Local
Attack complexity High
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

What the vulnerability does

01Description

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 An attacker who can execute this command can force the system to access memory locations that are no longer valid.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.

Key dates

02Disclosure timeline

November 18, 2025 CVE published
December 19, 2025 Record updated