---
id: CVE-2025-54770
title: >-
  A vulnerability has been identified in the GRUB2 bootloader's network module
  that poses an immediate Denial of Service (DoS) risk
summary: >-
  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 …
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-825
published: '2025-11-18'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-54770'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2025-54770'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2413813'
    label: secalert@redhat.com
  - url: 'https://lists.gnu.org/archive/html/grub-devel/2025-11/msg00155.html'
    label: secalert@redhat.com
  - url: 'http://www.openwall.com/lists/oss-security/2025/11/18/4'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00147
epssPercentile: 0.0326
ingestedAt: '2026-06-29T13:24:34.604Z'
---

## Overview

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 An attacker who can execute this command can force the system to access memory locations that are no longer valid.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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.