High severity · published Apr 21, 2026
CVE-2026-40706
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…
8.4
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NT
NTFS-3G · Tuxera
2022.10.3 before 2026.2.25 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40706
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40706
github.com
https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027
github.com
https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
github.com
https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9
www.openwall.com
https://www.openwall.com/lists/oss-security/2026/04/21/4
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/04/21/4
lists.debian.org
https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html
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