Description
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.
Published: 2026-04-21
Score: 8.4 High
EPSS: < 1% Very Low
KEV: No
Impact: Privilege Escalation
Action: Immediate Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4544-1 ntfs-3g security update
Debian DSA Debian DSA DSA-6221-1 ntfs-3g security update
History

Wed, 22 Apr 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 22 Apr 2026 07:15:00 +0000

Type Values Removed Values Added
Title NTFS-3G SUID-root Heap Buffer Overflow Enables Privilege Escalation

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Description 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.
First Time appeared Tuxera
Tuxera ntfs-3g
Weaknesses CWE-122
CPEs cpe:2.3:a:tuxera:ntfs-3g:*:*:*:*:*:*:*:*
Vendors & Products Tuxera
Tuxera ntfs-3g
References
Metrics cvssV3_1

{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-22T15:35:30.245Z

Reserved: 2026-04-15T00:00:00.000Z

Link: CVE-2026-40706

cve-icon Vulnrichment

Updated: 2026-04-21T21:20:00.477Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-21T22:16:19.077

Modified: 2026-04-22T21:23:52.620

Link: CVE-2026-40706

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-22T07:00:12Z

Weaknesses