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.

• azl3 ntfs-3g 2022.10.3-2 on Azure Linux 3.0

• cbl2 ntfs-3g 2022.10.3-2 on CBL Mariner 2.0

• cbl2 ntfs-3g 2022.10.3-2 on CBL-Mariner 2.0

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

1. Oct 8, 2026 at 9:05 AM UTC
   • The vendor changed the advisory title.
   • Added affected products: cbl2 ntfs-3g 2022.10.3-2 on CBL-Mariner 2.0.
   • The vendor changed its remediation guidance.

1. Apr 23, 2026 at 1:03 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 25, 2026 at 2:16 AM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

3. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

4. Nov 10, 2026 at 2:00 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.