Vulnerability-Lookup

OESA-2026-2102 (CVE-2026-40706)

Vulnerability from osv_openeuler – Published: 2026-04-25 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

ntfs-3g security update

Details

NTFS-3G is a stable, open source, GPL licensed, POSIX, read/write NTFS driver for Linux and many other operating systems. It provides safe handling of the Windows XP, Windows Server 2003, Windows 2000, Windows Vista, Windows Server 2008 and Windows 7 NTFS file systems.

Security Fix(es):

A heap buffer overflow exists in ntfs_build_permissions_posix() (acls.c:4011-4027) 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.

The overflow size is attacker-controlled (8 to 14,000+ bytes) and writes partially attacker-controlled data (POSIX_ACE entries with attacker-derived GID values) past the heap allocation. This corrupts adjacent glibc heap chunk metadata, as confirmed by a crash in _int_free() with "free(): corrupted unsorted chunks".(CVE-2026-40706)

Severity

8.4 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-40706	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "ntfs-3g-2022.5.17-4.oe2003sp4.aarch64.rpm",
          "ntfs-3g-debuginfo-2022.5.17-4.oe2003sp4.aarch64.rpm",
          "ntfs-3g-debugsource-2022.5.17-4.oe2003sp4.aarch64.rpm",
          "ntfs-3g-devel-2022.5.17-4.oe2003sp4.aarch64.rpm",
          "ntfs-3g-help-2022.5.17-4.oe2003sp4.aarch64.rpm"
        ],
        "src": [
          "ntfs-3g-2022.5.17-4.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "ntfs-3g-2022.5.17-4.oe2003sp4.x86_64.rpm",
          "ntfs-3g-debuginfo-2022.5.17-4.oe2003sp4.x86_64.rpm",
          "ntfs-3g-debugsource-2022.5.17-4.oe2003sp4.x86_64.rpm",
          "ntfs-3g-devel-2022.5.17-4.oe2003sp4.x86_64.rpm",
          "ntfs-3g-help-2022.5.17-4.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "ntfs-3g",
        "purl": "pkg:rpm/openEuler/ntfs-3g\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2022.5.17-4.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "NTFS-3G is a stable, open source, GPL licensed, POSIX, read/write NTFS driver for Linux and many other operating systems. It provides safe handling of the Windows XP, Windows Server 2003, Windows 2000, Windows Vista, Windows Server 2008 and Windows 7 NTFS file systems.\r\n\r\nSecurity Fix(es):\n\nA heap buffer overflow exists in ntfs_build_permissions_posix() (acls.c:4011-4027) 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.\n\nThe overflow size is attacker-controlled (8 to 14,000+ bytes) and writes partially attacker-controlled data (POSIX_ACE entries with attacker-derived GID values) past the heap allocation. This corrupts adjacent glibc heap chunk metadata, as confirmed by a crash in _int_free() with \u0026quot;free(): corrupted unsorted chunks\u0026quot;.(CVE-2026-40706)",
  "id": "OESA-2026-2102",
  "modified": "2026-08-06T11:11:05Z",
  "published": "2026-04-25T11:11:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2102"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40706"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ntfs-3g security update",
  "upstream": [
    "CVE-2026-40706"
  ]
}

CVE-2026-40706 (GCVE-0-2026-40706)

Vulnerability from cvelistv5 – Published: 2026-04-21 00:00 – Updated: 2026-04-22 15:35

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.

Severity

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 13:03 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

mitre mitre root

References

6 references

URL	Tags
https://github.com/tuxera/ntfs-3g/blob/d3ace19838…
https://www.openwall.com/lists/oss-security/2026/…
https://github.com/tuxera/ntfs-3g/security/adviso…
https://github.com/tuxera/ntfs-3g/releases/tag/20…
https://lists.debian.org/debian-lts-announce/2026…
http://www.openwall.com/lists/oss-security/2026/04/21/4

Impacted products

1 product

Vendor	Product	Version
Tuxera	NTFS-3G	Affected: 2022.10.3 , < 2026.2.25 (custom) cpe:2.3:a:tuxera:ntfs-3g::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-04-21T21:20:00.477Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/04/21/4"
          }
        ],
        "title": "CVE Program Container"
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        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-40706",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T13:03:14.635555Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
          "dateUpdated": "2026-04-22T15:35:30.245Z",
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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "NTFS-3G",
          "vendor": "Tuxera",
          "versions": [
            {
              "lessThan": "2026.2.25",
              "status": "affected",
              "version": "2022.10.3",
              "versionType": "custom"
            }
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        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:a:tuxera:ntfs-3g:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2022.10.3",
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                }
              ],
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      "descriptions": [
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      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
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          "scenarios": [
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      "references": [
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          "url": "https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027"
        },
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          "url": "https://www.openwall.com/lists/oss-security/2026/04/21/4"
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          "url": "https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9"
        },
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  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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    "cveId": "CVE-2026-40706",
    "datePublished": "2026-04-21T00:00:00.000Z",
    "dateReserved": "2026-04-15T00:00:00.000Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.