FKIE_CVE-2026-40706

Vulnerability from fkie_nvd - Published: 2026-04-21 22:16 - Updated: 2026-04-22 21:23
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfs_build_permissions_posix() in acls.c that allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered on the READ path (stat, readdir, open) when processing a security descriptor with multiple ACCESS_DENIED ACEs containing WRITE_OWNER from distinct group SIDs.
References
cve@mitre.orghttps://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027
cve@mitre.orghttps://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
cve@mitre.orghttps://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2026/04/21/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/04/21/4
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfs_build_permissions_posix() in acls.c that allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered on the READ path (stat, readdir, open) when processing a security descriptor with multiple ACCESS_DENIED ACEs containing WRITE_OWNER from distinct group SIDs."
    }
  ],
  "id": "CVE-2026-40706",
  "lastModified": "2026-04-22T21:23:52.620",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-21T22:16:19.077",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://www.openwall.com/lists/oss-security/2026/04/21/4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/21/4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Primary"
    }
  ]
}


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