Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
Summary
| CVE | CVE-2023-4692 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-10-25 18:17:41 UTC |
| Updated | 2026-07-21 06:16:27 UTC |
| Description | An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.005360000 probability, percentile 0.416850000 (date 2026-07-21)
Problem Types: CWE-122 | CWE-787 | CWE-122 Heap-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Gnu | Grub2 | All | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 1:2.02-156.el8 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 1:2.06-77.el9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2024:3184 | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | |
| lists.fedoraproject.org/archives/list/[email protected]/messag... | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| lists.fedoraproject.org/archives/list/[email protected]/messag... | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| lists.debian.org/debian-lts-announce/2023/10/msg00007.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | |
| oss-sec: CVE-2023-4692, CVE-2023-4693: grub2: OOB write, read via specially crafted NTFS filesystem | af854a3a-2127-422b-91ae-364da2661108 | seclists.org | Mailing List, Third Party Advisory |
| lists.fedoraproject.org/archives/list/[email protected]/messag... | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| GRUB: Multiple Vulnerabilities (GLSA 202311-14) — Gentoo security | af854a3a-2127-422b-91ae-364da2661108 | security.gentoo.org | |
| 2236613 – (CVE-2023-4692) CVE-2023-4692 grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution | af854a3a-2127-422b-91ae-364da2661108 | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| CVE-2023-4692, CVE-2023-4693: vulnerabilities in the GRUB boot manager – My DFIR Blog | af854a3a-2127-422b-91ae-364da2661108 | dfir.ru | Exploit, Third Party Advisory |
| cve-details | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2024:2456 | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | |
| security.netapp.com/advisory/ntap-20231208-0002 | af854a3a-2127-422b-91ae-364da2661108 | security.netapp.com | |
| [SECURITY PATCH 0/6] GRUB2 NTFS driver vulnerabilities - 2023/10/03 | af854a3a-2127-422b-91ae-364da2661108 | lists.gnu.org | Mailing List |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2023-08-31T00:00:00.000Z | Reported to Red Hat. |
| CNA | 2023-10-03T00:00:00.000Z | Made public. |
Legacy QID Mappings
- 199802 Ubuntu Security Notification for GRUB2 Vulnerabilities (USN-6410-1)
- 356438 Amazon Linux Security Advisory for grub2 : ALAS2-2023-2292
- 356613 Amazon Linux Security Advisory for grub2 : ALAS2023-2023-409
- 356635 Amazon Linux Security Advisory for grub2 : ALAS2023-2023-408
- 6000116 Debian Security Update for grub2 (DLA 3605-1)
- 6000174 Debian Security Update for grub2 (DSA 5519-1)
- 673348 EulerOS Security Update for grub2 (EulerOS-SA-2023-3301)
- 673390 EulerOS Security Update for grub2 (EulerOS-SA-2024-1060)
- 673506 EulerOS Security Update for grub2 (EulerOS-SA-2023-3333)
- 673603 EulerOS Security Update for grub2 (EulerOS-SA-2023-3272)
- 673664 EulerOS Security Update for grub2 (EulerOS-SA-2024-1270)
- 673921 EulerOS Security Update for grub2 (EulerOS-SA-2024-1141)
- 674062 EulerOS Security Update for grub2 (EulerOS-SA-2023-3244)
- 674085 EulerOS Security Update for grub2 (EulerOS-SA-2024-1084)
- 710796 Gentoo Linux GRUB Multiple Vulnerabilities (GLSA 202311-14)
- 755093 SUSE Enterprise Linux Security Update for grub2 (SUSE-SU-2023:4085-1)
- 755116 SUSE Enterprise Linux Security Update for grub2 (SUSE-SU-2023:4130-1)
- 755125 SUSE Enterprise Linux Security Update for grub2 (SUSE-SU-2023:4141-1)
- 755126 SUSE Enterprise Linux Security Update for grub2 (SUSE-SU-2023:4140-1)
- 908018 Common Base Linux Mariner (CBL-Mariner) Security Update for grub2 (31686-1)