CVE-2026-40706
- State
- Published
- Severity
- 8.4 High
- Published
- Apr 21, 2026
- Updated
- Apr 22, 2026
- Reserved
- Apr 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.4 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | mitre |
Weaknesses
- CWE-122 Heap-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
NTFS-3GTuxera |
|
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
- https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html
- http://www.openwall.com/lists/oss-security/2026/04/21/4
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.