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Weekly Signal
Live intelligence Updated 20 Aug 2026 · 23:28 UTC

GNU, Redhat · Grub2, Enterprise Linux

CVE-2023-4692

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 files...

Recommended action

Handle this through the normal risk-based patching cycle while monitoring for change. Red Hat Security advisory RHSA-2024:2456

View response plan
CVSS7.8
EPSS0.5%
KEVNo
ExploitationNone
RemediationNot yet verified ↓

Assessment

Why it matters

EPSS is 0.5%; technical severity is CVSS 7.8.

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.

Who should care

  • Teams operating Grub2, Enterprise Linux
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Grub2, Enterprise Linux is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Red Hat Security advisory RHSA-2024:2456
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Advisory

Technical details

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-122
Affected versions
GNU Grub2 (End Excluding 2.12); Redhat Enterprise Linux (Version 8.0 | Version 9.0)
Fixed versions
GNU Grub2 (Fixed from 2.12)
Published
25 October 2023
Attack vector
Local
Privileges required
Low
User interaction
None

Signal timeline

  1. CVE published
  2. Latest EPSS score: 0.5%
  3. Signal calculated at 12

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.