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...
CVE-2026-40706 is fixed in 4 products on 1 platform, first by libntfs-3g89t64 1:2022.10.3-5ubuntu1, released April 21, 2026. It is not reported as exploited. Patch Radar priority: 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 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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libntfs-3g89 · Ubuntu 22.04.1 LTS (jammy) | 1:2021.8.22-3ubuntu1.3 | libntfs-3g89 1:2021.8.22-3ubuntu1.3 | Apr 30, 2026 |
| libntfs-3g89t64 · Ubuntu 24.04.5 LTS (noble) | 1:2022.10.3-1.2ubuntu3.1 | libntfs-3g89t64 1:2022.10.3-1.2ubuntu3.1 | Apr 30, 2026 |
| libntfs-3g89t64 · Ubuntu 25.10 (questing) | 1:2022.10.3-5ubuntu0.25.10.1 | libntfs-3g89t64 1:2022.10.3-5ubuntu0.25.10.1 | Apr 30, 2026 |
| libntfs-3g89t64 · Ubuntu 26.04.1 LTS (resolute) | 1:2022.10.3-5ubuntu1 | libntfs-3g89t64 1:2022.10.3-5ubuntu1 | Apr 21, 2026 |
| ntfs-3g · Debian 12.15 (bookworm) | 1:2022.10.3-1+deb12u3 | DEBIAN-CVE-2026-40706 | May 15, 2026 |
| ntfs-3g · Debian 13.5 (trixie) | 1:2022.10.3-5+deb13u1 | DEBIAN-CVE-2026-40706 | May 15, 2026 |
| ntfs-3g · Debian 14 | 1:2026.2.25-1 | DEBIAN-CVE-2026-40706 | May 15, 2026 |
| ntfs-3g · Ubuntu 22.04.1 LTS (jammy) | 1:2021.8.22-3ubuntu1.3 | ntfs-3g 1:2021.8.22-3ubuntu1.3 | Apr 30, 2026 |
| ntfs-3g · Ubuntu 24.04.5 LTS (noble) | 1:2022.10.3-1.2ubuntu3.1 | ntfs-3g 1:2022.10.3-1.2ubuntu3.1 | Apr 30, 2026 |
| ntfs-3g · Ubuntu 25.10 (questing) | 1:2022.10.3-5ubuntu0.25.10.1 | ntfs-3g 1:2022.10.3-5ubuntu0.25.10.1 | Apr 30, 2026 |
| ntfs-3g · Ubuntu 26.04.1 LTS (resolute) | 1:2022.10.3-5ubuntu1 | ntfs-3g 1:2022.10.3-5ubuntu1 | Apr 21, 2026 |
| ntfs-3g_ntfsprogs · sles 15.6 | 2022.5.17-150000.3.24.1 | SUSE-SU-2026:1571-1 | Apr 23, 2026 |
| ntfs-3g_ntfsprogs · sles 15.7 | 2022.5.17-150000.3.24.1 | SUSE-SU-2026:1571-1 | Apr 23, 2026 |
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