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TI-2023-04324 Aliases CVE-2023-4692GHSA-6w7h-fpm5-3ww6

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

Priority HIGH 69CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 2 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0054 45th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial grub: 2.12Red Hat: 2 advisoriesRed Hat: 2 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—grub—2.12Patch availableCNA
Red HatRed Hat Enterprise Linux 8—1:2.02-156.el8Patch availableCNA
Red HatRed Hat Enterprise Linux 9—1:2.06-77.el9Patch availableCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
  • grub Vendor— Affected — Fixed in 2.12 Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 1:2.02-156.el8 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1:2.06-77.el9 Patch available CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*before 2.12VulnerableGNU
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
  • cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* Versions before 2.12 Vulnerable ·GNU
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA grub Fixed in 2.12

Red Hat 2 advisories

  • RHSA-2024:3184 Released 2024-05-22 · Red Hat rating Moderate
    grub2 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) grub2-1:2.02-156.el8, grub2-common-1:2.02-156.el8, grub2-efi-aa64-1:2.02-156.el8 +16
  • RHSA-2024:2456 Released 2024-04-30 · Red Hat rating Moderate
    grub2 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) grub2-1:2.06-77.el9, grub2-common-1:2.06-77.el9, grub2-efi-aa64-1:2.06-77.el9 +13

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2024:3184
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2024:2456

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-4692
  2. 2026-10-03 Alias added: GHSA-6w7h-fpm5-3ww6

References

Exploit 1

Advisory 5

Other 1

  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
See all 1955 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences