CVE-2026-40706: CWE-122 Heap-based Buffer Overflow in Tuxera NTFS-3G
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.
AI Analysis
Technical Summary
A heap-based buffer overflow exists in the ntfs_build_permissions_posix() function within acls.c in Tuxera NTFS-3G version 2022.10.3 and earlier before 2026.2.25. The vulnerability is triggered during read operations (stat, readdir, open) when the software processes a security descriptor containing multiple ACCESS_DENIED ACEs with WRITE_OWNER flags from distinct group SIDs. This flaw allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The vulnerability is tracked as CVE-2026-40706 and is classified under CWE-122 (heap-based buffer overflow). The CVSS v3.1 base score is 8.4, indicating high severity with local attack vector, low attack complexity, no privileges required, no user interaction, and impacts to confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability can lead to heap memory corruption in the SUID-root ntfs-3g binary, potentially allowing an attacker to execute arbitrary code with elevated privileges or cause a denial of service. The vulnerability affects the confidentiality, integrity, and availability of the affected system. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
No official patch or remediation is currently available for this vulnerability. Users should monitor Tuxera's advisories for updates regarding fixes. Until a patch is released, avoid mounting or processing untrusted or malicious NTFS images with the affected NTFS-3G version. Employ standard security best practices to limit exposure to untrusted media.
CVE-2026-40706: CWE-122 Heap-based Buffer Overflow in Tuxera NTFS-3G
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
A heap-based buffer overflow exists in the ntfs_build_permissions_posix() function within acls.c in Tuxera NTFS-3G version 2022.10.3 and earlier before 2026.2.25. The vulnerability is triggered during read operations (stat, readdir, open) when the software processes a security descriptor containing multiple ACCESS_DENIED ACEs with WRITE_OWNER flags from distinct group SIDs. This flaw allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The vulnerability is tracked as CVE-2026-40706 and is classified under CWE-122 (heap-based buffer overflow). The CVSS v3.1 base score is 8.4, indicating high severity with local attack vector, low attack complexity, no privileges required, no user interaction, and impacts to confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability can lead to heap memory corruption in the SUID-root ntfs-3g binary, potentially allowing an attacker to execute arbitrary code with elevated privileges or cause a denial of service. The vulnerability affects the confidentiality, integrity, and availability of the affected system. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
No official patch or remediation is currently available for this vulnerability. Users should monitor Tuxera's advisories for updates regarding fixes. Until a patch is released, avoid mounting or processing untrusted or malicious NTFS images with the affected NTFS-3G version. Employ standard security best practices to limit exposure to untrusted media.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-15T00:00:00.000Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e7e91619fe3cd2cdfaec3d
Added to database: 4/21/2026, 9:16:06 PM
Last enriched: 4/21/2026, 9:31:20 PM
Last updated: 4/22/2026, 6:59:19 AM
Views: 10
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