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CVE

CWE

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CVE-2026-40706

Published: Apr 21, 2026

Modified: Apr 22, 2026

PUBLISHED

CVSS v3.1

8.4

HIGH

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.

Vendor	Product	Versions
Tuxera	NTFS-3G	affected `2022.10.3 - < 2026.2.25`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027

https://www.openwall.com/lists/oss-security/2026/04/21/4

https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9

https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25

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