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.
References6
- github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d…
- github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
- github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63…
- www.openwall.com/lists/oss-security/2026/04/21/4
- www.openwall.com/lists/oss-security/2026/04/21/4
- lists.debian.org/debian-lts-announce/2026/04/msg00024.html
Metrics
- CVSS 3.1
-
8.4
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 6 · as of 13 November 2026
- CWE
- CWE-122
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.