---
id: CVE-2026-89615
title: 'fs/ntfs3: bound page_lcns[] index by the log record'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs/ntfs3: bound page_lcns[] index by the log record

  The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i,
  where i runs up to the log record's lcns_f…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    31fdd11f75da9823500168cecb07aa45130915a3
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    bb742d1030864c0fe140666f639428ba4e90b2ca
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    61ca8cbbf68f77f25b699ed4358bd232f94ed43b
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    f4c1bc6d7331f344ffcea93c2a37badcbe15baa6
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    7ccb94901f38a062034b56b43c774050b113758f
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    1135ebc225996b3ac1a295652b19a0a706737a6c
  - >-
    Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 <
    6f7b9dbdc1b7520206abce0049bdd143eb536e75
  - Linux 5.15
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:47.839Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89615'
references:
  - url: 'https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3'
  - url: 'https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca'
  - url: 'https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b'
  - url: 'https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6'
  - url: 'https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f'
  - url: 'https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c'
  - url: 'https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89615.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89615'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532402'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89615'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89615'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89615.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00152
epssPercentile: 0.04298
scores:
  cna: 8.4
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

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

fs/ntfs3: bound page_lcns[] index by the log record

The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i,
where i runs up to the log record's lcns_follow. That count is checked only
against the record's own length, not the target entry, so check_dp_table()
(which validates the entry's lcns_follow) does not cover it: the copy_lcns
entry may even be freshly allocated after that check, and find_dp() bounds j
but not i. A crafted record thus overflows page_lcns[] of an otherwise valid
entry.

Add dp_range_ok() and reject, before each loop, any record whose run does
not fit the entry. These are the only two page_lcns[] accesses indexed by
the record rather than the entry, so together with the entry validation
every access is now bounded.

[almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]

## Affected

- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 31fdd11f75da9823500168cecb07aa45130915a3`
- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < bb742d1030864c0fe140666f639428ba4e90b2ca`
- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 61ca8cbbf68f77f25b699ed4358bd232f94ed43b`
- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < f4c1bc6d7331f344ffcea93c2a37badcbe15baa6`
- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 7ccb94901f38a062034b56b43c774050b113758f`
- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 1135ebc225996b3ac1a295652b19a0a706737a6c`
- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 6f7b9dbdc1b7520206abce0049bdd143eb536e75`
- `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-2026-89615.json)