Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/
- https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
- https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9
- https://www.openwall.com/lists/oss-security/2026/04/21/4
- http://www.openwall.com/lists/oss-security/2026/04/21/4
- https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html
FAQ
What is CVE-2026-40706?
CVE-2026-40706 is a vulnerability with a CVSS score of 8.4 (HIGH). 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 craft...
How severe is CVE-2026-40706?
CVE-2026-40706 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40706?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.