---
id: CVE-2026-89617
title: 'fs/ntfs3: validate dirty page table on log replay'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs/ntfs3: validate dirty page table on log replay

  Each DIR_PAGE_ENTRY ends in a page_lcns[] array whose length is the on-disk
  lcns_follow field. check_rstbl() validate…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: Linux
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: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:49.792Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89617'
references:
  - 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'
  - 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
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00139
epssPercentile: 0.03214
scores:
  cna: 7.8
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: validate dirty page table on log replay

Each DIR_PAGE_ENTRY ends in a page_lcns[] array whose length is the on-disk
lcns_follow field. check_rstbl() validates the table bookkeeping but never
checks that this array fits in the entry, so a crafted lcns_follow lets the
v0->v1 conversion memmove and later replay passes run off the entry.

Add check_dp_table() to reject, right after check_rstbl(), any entry larger
than its size claims via struct_size() (the same expression used to allocate
these entries, so the check is overflow-safe by construction). All consumers
can then trust lcns_follow as the real capacity. This covers every
page_lcns[] access whose index is bounded by the entry itself (the
conversion memmove, the HotFix store via find_dp(), and the self-bounded
scan loops). Accesses whose index comes from the log record need a separate
bound and are handled in a follow-up patch.

## 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`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)