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Fencer Vulns
high 8.4

CVE-2026-40706 json

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…

published 2026-04-21 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-24467

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

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.

Patch / fix

  • Tuxera NTFS-3G 2026.2.25
  • ntfs-3g Debian 12 1:2022.10.3-1+deb12u3
  • ntfs-3g Debian 13 1:2022.10.3-5+deb13u1
  • ntfs-3g Debian 14 1:2026.2.25-1

debian advisories DEBIAN-CVE-2026-40706

  • ntfs-3g Ubuntu 22.04 LTS 1:2021.8.22-3ubuntu1.3
  • ntfs-3g Ubuntu 24.04 LTS 1:2022.10.3-1.2ubuntu3.1
  • ntfs-3g Ubuntu 25.10 1:2022.10.3-5ubuntu0.25.10.1
  • ntfs-3g Ubuntu 26.04 LTS 1:2022.10.3-5ubuntu1

ubuntu advisories UBUNTU-CVE-2026-40706

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ntfs-3g_ntfsprogs SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 2022.5.17-150000.3.24.1

suse advisories SUSE-SU-2026:1571-1

  • ntfs-3g_ntfsprogs openSUSE Tumbleweed 2022.10.3-6.1

opensuse advisories openSUSE-SU-2026:10614-1

  • ntfs-3g Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2026.2.25-r0

alpine advisories ALPINE-CVE-2026-40706

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ntfs-3g Azure Linux 3.0 2022.10.3-3

azure linux advisories AZL-83181

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-40706 updated cvss 7.5

ntfs-3g: NTFS-3G: Arbitrary code execution via crafted NTFS image

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
6 mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Tuxera NTFS-3G

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.