---
id: CVE-2026-89617
title: 'kernel: fs/ntfs3: validate dirty page table on log replay (CVE-2026-89617)'
summary: >-
  A flaw was found in the Linux kernel's NTFS3 filesystem driver. An attacker
  with local access could craft a malicious NTFS log file. During log replay,
  insufficient validation of the `lcns_follow` field in a `DIR_PAGE_ENTRY` could
  lead to …
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: Linux
affected:
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    0e07ea2fc45a7b4757ef7bf1f692cc0180a08323
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    1e90b1703ee1a04cd3e9e399353fc536f5f3ba10
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    d23155634a4bc1183e761d5eb2c043b2e693cc98
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    1200c2779c43b62656ccbb67df9468a7a9af2484
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    0908da07c23be4f94b99dfd9a94765525f0fe4bd
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    006cb7713dec10368e699abc4367e5faa334c9a5
  - Linux 5.15
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T22:37:04+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89617.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89617.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89617'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532222'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89617'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89617'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89617.mbox
  - url: 'https://git.kernel.org/stable/c/0e07ea2fc45a7b4757ef7bf1f692cc0180a08323'
  - url: 'https://git.kernel.org/stable/c/1e90b1703ee1a04cd3e9e399353fc536f5f3ba10'
  - url: 'https://git.kernel.org/stable/c/d23155634a4bc1183e761d5eb2c043b2e693cc98'
  - url: 'https://git.kernel.org/stable/c/1200c2779c43b62656ccbb67df9468a7a9af2484'
  - url: 'https://git.kernel.org/stable/c/2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56'
  - url: 'https://git.kernel.org/stable/c/0908da07c23be4f94b99dfd9a94765525f0fe4bd'
  - url: 'https://git.kernel.org/stable/c/006cb7713dec10368e699abc4367e5faa334c9a5'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00138
epssPercentile: 0.03602
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

A flaw was found in the Linux kernel's NTFS3 filesystem driver. An attacker with local access could craft a malicious NTFS log file. During log replay, insufficient validation of the `lcns_follow` field in a `DIR_PAGE_ENTRY` could lead to an out-of-bounds write. This memory corruption could result in a system crash (denial of service) or potentially allow for further exploitation.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89617.json)

**kernel: fs/ntfs3: validate dirty page table on log replay** — 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.