---
id: CVE-2026-89611
title: 'kernel: ntfs: validate non-resident attribute offsets (CVE-2026-89611)'
summary: >-
  A flaw was found in the Linux kernel. The NTFS file system driver does not
  properly validate non-resident attribute offsets when converting between
  sparse and non-sparse attributes. A local attacker could craft a malicious
  Master File Tabl…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T22:15:33+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89611.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89611.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89611'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532167'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89611'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89611'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89611.mbox
  - url: 'https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c'
  - url: 'https://git.kernel.org/stable/c/cd7b3dc7557faadeea626034e3bac68a449851ef'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00553
epssPercentile: 0.4377
scores:
  vendor: 5.7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

A flaw was found in the Linux kernel. The NTFS file system driver does not properly validate non-resident attribute offsets when converting between sparse and non-sparse attributes. A local attacker could craft a malicious Master File Table (MFT) record, which could lead to writing data beyond allocated memory boundaries or overlapping with other critical data. This memory corruption could result in a denial of service (DoS) or system instability.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89611.json)

**kernel: ntfs: validate non-resident attribute offsets** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.