synced 11 MIN AGO
01 Record

CVE-2023-4692

Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution

HighPUBLISHEDCNA: redhat
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
View raw JSON

02 Description

Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.54% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 45.1% of scored records. A rank, not a probability.
NVD base score
7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-07-21.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-10-25 10:27Z3 YR AGO
Last updated
2026-07-21 05:08Z3 MO AGO
Reserved
2023-08-31
Assigning CNA
redhat
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Weaknesses
  • CWE-122Heap-based Buffer OverflowVariant
  • CWE-787Out-of-bounds WriteBase
Data version
5.2
Document digest
4b372385335f17a62fea9e9b663e3e46981ae5d13d7764ef4f27dcfdf65feaaf

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Enterprise Linux 7Not specified—

06 References

07 Fixed in

AlmaLinux 8

  • grub2-common
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-aa64
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-aa64-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-ia32
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-ia32-cdboot
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-ia32-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-x64
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-x64-cdboot
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-x64-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-pc
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-pc-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-ppc64le
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-ppc64le-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools-efi
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools-extra
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools-minimal
    Fixed in 1:2.02-156.el8.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • grub2-common
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-aa64
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-aa64-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-x64
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-x64-cdboot
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-x64-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-pc
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-pc-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-ppc64le
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-ppc64le-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools-efi
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools-extra
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools-minimal
    Fixed in 1:2.06-77.el9.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • grub2-common
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-aa64
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-aa64-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-ia32
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-ia32-cdboot
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-ia32-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-x64
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-x64-cdboot
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-efi-x64-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-pc
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-pc-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-ppc64le
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-ppc64le-modules
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools-efi
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools-extra
    Fixed in 1:2.02-156.el8.alma.1
  • grub2-tools-minimal
    Fixed in 1:2.02-156.el8.alma.1

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • grub2-common
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-aa64
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-aa64-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-x64
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-x64-cdboot
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-efi-x64-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-pc
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-pc-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-ppc64le
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-ppc64le-modules
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools-efi
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools-extra
    Fixed in 1:2.06-77.el9.alma.1
  • grub2-tools-minimal
    Fixed in 1:2.06-77.el9.alma.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • grub2
    Fixed in 2.06-13+deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • grub2
    Fixed in 2.12~rc1-11

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • grub2
    Fixed in 2.12~rc1-11

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • grub2-signed
    No fix yet
  • grub2-unsigned
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • grub2-signed
    No fix yet
  • grub2-unsigned
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • grub2-signed
    Fixed in 1.187.6~20.04.1
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • grub2-signed
    Fixed in 1.187.6
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • grub2-signed
    Fixed in 1.197
  • grub2-unsigned
    Fixed in 2.12~rc1-10ubuntu4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • grub2-signed
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.