HIGH 8.4 Microsoft
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 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.
Microsoft Security Update 2026-Apr: 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.
Affected Products
- azl3 ntfs-3g 2022.10.3-2 on Azure Linux 3.0
- cbl2 ntfs-3g 2022.10.3-2 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40706
- https://nvd.nist.gov/vuln/detail/CVE-2026-40706
This high severity vulnerability with a CVSS score of 8.4 was published on 2026-04-14 via Microsoft. Affected: azl3 ntfs-3g 2022.10.3-2 on Azure Linux 3.0, cbl2 ntfs-3g 2022.10.3-2 on CBL Mariner 2.0.
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