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NTFS-3G CVE-2026-46569

MEDIUM
2026-07-15 vendor:ubuntu
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Severity by source

vuln.today AI
8.6 HIGH

Local vector because a crafted image must be physically or logically present; PR:N since unprivileged users trigger ntfs-3g mounts; S:C due to SUID-root escalation potential.

3.1 AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.1 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Lifecycle Timeline

1
Analysis Generated
Jul 16, 2026 - 16:34 vuln.today

DescriptionCVE.org

In NTFS-3G through 2026.2.25, a heap buffer overflow exists in ntfs_ib_copy_tail(), in libntfs-3g/index.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 by extending a directory, e.g., by creating a file.

AnalysisAI

Heap buffer overflow in NTFS-3G through 2026.2.25 allows a local attacker to corrupt heap memory in the SUID-root ntfs-3g binary by supplying a crafted NTFS image, with exploitation triggered when a directory is extended (e.g., a file is created) on the mounted filesystem. Because ntfs-3g carries the SUID-root bit to operate FUSE-based NTFS mounts, successful heap corruption in this context carries privilege escalation potential to root. No public exploit code has been identified at time of analysis; a vendor-released patch is available via Ubuntu USN-8554-1.

Technical ContextAI

NTFS-3G is a stable, open-source NTFS driver implemented in userspace via FUSE, widely shipped on Linux distributions to enable read/write access to Windows NTFS filesystems. The affected code path is ntfs_ib_copy_tail() in libntfs-3g/index.c, which handles the copying of index block tail data during B-tree node operations on directory indexes. When a directory is extended - as occurs when a new file is created and the on-disk index B-tree node must split or reallocate - crafted on-disk metadata can cause this function to write beyond the bounds of a heap-allocated buffer. Because the ntfs-3g binary is typically installed setuid-root to allow unprivileged FUSE mounts, any heap corruption occurring within that process context runs with elevated privileges. No CWE is formally assigned in the NVD record, but the flaw class is clearly CWE-122 (Heap-Based Buffer Overflow). The CPE string is not provided, but the affected product is ntfs-3g/ntfs-3g versions through 2026.2.25.

Affected ProductsAI

NTFS-3G through version 2026.2.25 is confirmed affected per the CVE description. Ubuntu has issued a security notice (USN-8554-1, available at https://ubuntu.com/security/notices/USN-8554-1) addressing this vulnerability; users of Ubuntu-packaged ntfs-3g should consult this advisory for the specific patched package version. Other Linux distributions shipping ntfs-3g (Debian, Fedora, Arch, etc.) should be considered potentially affected until their respective advisories confirm patch status. No CPE string was provided in the input data.

RemediationAI

Apply the vendor-released patch by updating ntfs-3g via the system package manager. Ubuntu users should run 'apt-get update && apt-get upgrade ntfs-3g' and reference USN-8554-1 at https://ubuntu.com/security/notices/USN-8554-1 for the specific fixed package version; the exact upstream patched version number was not independently confirmed in the available data beyond 'patch available from vendor.' As a compensating control on systems where the patch cannot be immediately applied, removing the SUID bit from the ntfs-3g binary ('chmod -s /usr/bin/ntfs-3g') prevents privilege escalation by requiring root to explicitly invoke the binary, though this breaks unprivileged NTFS mounting via FUSE and may disrupt desktop automount workflows. Alternatively, blocking automounting of removable media via udisks2 policy reduces the attack surface for physical-access scenarios, at the cost of requiring manual root-level mounting. Restricting physical access and disabling USB automount are complementary controls for environments that cannot patch immediately.

Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Development Tools 15 SP7 Fixed
SUSE Linux Enterprise Server 12 SP5-LTSS Fixed
SUSE Linux Enterprise Server 15 SP6-LTSS Fixed

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CVE-2026-46569 vulnerability details – vuln.today

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