---
id: CVE-2025-0678
title: A flaw was found in grub2
summary: >-
  A flaw was found in grub2. When reading data from a squash4 filesystem, grub's
  squash4 fs module uses user-controlled parameters from the filesystem geometry
  to determine the internal buffer size, however, it improperly checks for
  intege…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
  - CWE-190
vendor: gnu
product: grub2
affected:
  - grub2 <= 2.12
  - openshift_container_platform = 4.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
published: '2025-03-03'
updated: '2026-06-26'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-0678'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2025-0678'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2346118'
    label: secalert@redhat.com
  - url: 'https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00284
epssPercentile: 0.21177
ingestedAt: '2026-06-26T16:43:13.410Z'
---

## Overview

A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.

## Affected

- `grub2 <= 2.12`
- `openshift_container_platform = 4.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`

## Remediation

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