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CVE-2023-4693

Grub2: out-of-bounds read at fs/ntfs.c

publishedCWE-125

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.

Technical severity5.3 mediumCVSS 3.1 · CNA: redhat
Published2023-10-25Source updated 2026-11-02
Collected2026-11-033 attributed sources

Fixes and workarounds

No remediation reported in collected sources.

Missing remediation information is not evidence that no patch exists.

Affected products and versions

ProductVersionsAuthority
Red Hat Enterprise Linux 8
Red Hat
grub2
https://access.redhat.com/downloads/content/package-browser/ 		≥ 1:2.02-156.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 9
Red Hat
grub2
https://access.redhat.com/downloads/content/package-browser/ 		≥ 1:2.06-77.el9; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 7
Red Hat
grub2
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: affected 		CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (2)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "2.12",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

Version / scoreVectorAuthority
3.1 / 5.3
medium		 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:NCNA: redhat
3.1 / 4.6
medium		 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NNVD: [email protected]
3.1 / 5.3
medium		 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:NNVD: [email protected]

Exploit evidence

References

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