CVE-2025-54770 Grub2: use-after-free in net_set_vlan

Description

A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid.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

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