---
id: CVE-2023-4693
title: An out-of-bounds read flaw was found on grub2's NTFS filesystem driver
summary: >-
  An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This
  issue may allow a physically present attacker to present a specially crafted
  NTFS file system image to read arbitrary memory locations. A successful attack
  allo…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-125
  - CWE-125
vendor: gnu
product: grub2
affected:
  - grub2 < 2.12
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
patched:
  - grub2 2.12
published: '2023-10-25'
updated: '2026-07-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-4693'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:2456'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:3184'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2023-4693'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2238343'
    label: secalert@redhat.com
  - url: >-
      https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/
    label: secalert@redhat.com
  - url: 'https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html'
    label: secalert@redhat.com
  - url: 'https://seclists.org/oss-sec/2023/q4/37'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:2456'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:3184'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/CVE-2023-4693'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2238343'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00007.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUU42E7CPYLATXOYVYNW6YTXXULAOV6L/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OIRJ5UZRXX2KLR4IKBJEQUNGOCXMMDLY/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PERFILCHFEUGG3OAMC6W55P6DDIBZK4Q/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://seclists.org/oss-sec/2023/q4/37'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202311-14'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20231208-0002/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00496
epssPercentile: 0.41615
ingestedAt: '2026-07-21T06:47:32.942Z'
---

## Overview

An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.

## Affected

- `grub2 < 2.12`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`

## Remediation

Upgrade past the affected range:

- `grub2 2.12`