---
id: CVE-2026-89612
title: 'kernel: ntfs: reject invalid MFT LCNs from boot sector (CVE-2026-89612)'
summary: >-
  A flaw was found in the Linux kernel's NTFS filesystem driver. A local
  attacker could provide a specially crafted NTFS boot sector containing an
  invalid Master File Table (MFT) Logical Cluster Number (LCN). Due to an
  integer overflow durin…
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: '2026-09-18T22:15:38+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89612.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89612.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89612'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532112'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89612'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89612'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89612.mbox
  - url: 'https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5'
  - url: 'https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00553
epssPercentile: 0.43858
scores:
  vendor: 4.7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

A flaw was found in the Linux kernel's NTFS filesystem driver. A local attacker could provide a specially crafted NTFS boot sector containing an invalid Master File Table (MFT) Logical Cluster Number (LCN). Due to an integer overflow during parsing, this could lead to an out-of-bounds memory access. This vulnerability may result in system instability or a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89612.json)

**kernel: ntfs: reject invalid MFT LCNs from boot sector** — 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.