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CVE-2026-40706

HIGH

8.4

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.

CVE Details

CVSS v3.1 Score8.4

SeverityHIGH

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/21/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-122

References

https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027(cve@mitre.org)

https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25(cve@mitre.org)

https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9(cve@mitre.org)

https://www.openwall.com/lists/oss-security/2026/04/21/4(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2026/04/21/4(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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