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Vulnerabilities

Security incident · CVE-2023-4693

An out-of-bounds read flaw was found on grub2's NTFS filesystem driver.

Published Oct 25, 2023 · catalog updated Nov 7, 2026 · An out-of-bounds read flaw

Last checked Nov 8, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2023-4693. EPSS is 0.49%. Act only if a listed version of An out-of-bounds read flaw is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An out-of-bounds read flaw).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium4.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
Remediation
Version ranges on file
Affected products
cpe gnu/grub2 · cpe redhat/enterprise linux

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe gnu/grub2< 2.12
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0

How to fix CVE-2023-4693

  • Upgrade

    CVE-2023-4693 lists a fix boundary at 2.12. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 2.12

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-4693. EPSS is 0.49%. Act only if a listed version of An out-of-bounds read flaw is installed.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux 8.0; redhat/enterprise linux 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 0.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 25, 2023 · NIST NVD

    Detected

    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.

  2. Nov 7, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2023-4693

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2023-4693

    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 v

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 8, 2026
  • NIST NVDNov 7, 2026