---
id: CVE-2026-89616
title: 'fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()

  ni_read_frame() decompresses an LZNT $DATA frame into the vmapped target
  pages and then trusts de…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-908
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    7d60a4c49af4d5cb88aa7cbf998d0408bd415055
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    cd40eee4923d104ebec9ac7513b971bc441e431d
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    77d8efd04745cda23858546afdbd9d07b591758e
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    376ee45659a4b943df672ad275c63da00655f929
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    4a1b39b2e10eb8de86265e80cf2be4396bc1dce4
  - >-
    Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 <
    35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd
  - Linux 5.15
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:48.800Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89616'
references:
  - url: 'https://git.kernel.org/stable/c/7d60a4c49af4d5cb88aa7cbf998d0408bd415055'
  - url: 'https://git.kernel.org/stable/c/cd40eee4923d104ebec9ac7513b971bc441e431d'
  - url: 'https://git.kernel.org/stable/c/77d8efd04745cda23858546afdbd9d07b591758e'
  - url: 'https://git.kernel.org/stable/c/0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea'
  - url: 'https://git.kernel.org/stable/c/376ee45659a4b943df672ad275c63da00655f929'
  - url: 'https://git.kernel.org/stable/c/4a1b39b2e10eb8de86265e80cf2be4396bc1dce4'
  - url: 'https://git.kernel.org/stable/c/35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89616.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89616'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532395'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89616'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89616'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89616.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00415
epssPercentile: 0.35649
scores:
  cna: 7.5
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

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

fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()

ni_read_frame() decompresses an LZNT $DATA frame into the vmapped target
pages and then trusts decompress_lznt()'s return value:

  unc_size = decompress_lznt(frame_ondisk, ondisk_size, frame_mem,
                             frame_size);
  if ((ssize_t)unc_size < 0)        err = unc_size;
  else if (!unc_size || unc_size > frame_size)  err = -EINVAL;

decompress_lznt() stops as soon as the compressed stream is exhausted
(e.g. a zero chunk header) and returns the number of bytes it actually
wrote, which may be far less than frame_size. The bytes between unc_size
and frame_size are never written. The only memset() that follows zeroes
the region beyond i_valid; when the frame lies entirely within the file's
valid size that memset() does not run, so the gap retains whatever was in
the just-vmapped pages. All pages are then marked uptodate and returned
to userspace, disclosing uninitialized (recently-freed) kernel page
memory. A crafted compressed file whose stream decompresses to only a few
bytes leaks the remainder of every frame on a plain read(2), which is
enough to recover kernel pointers and defeat KASLR.

Zero the [unc_size, frame_size) tail immediately after a successful LZNT
decompress so the remainder reads back as zero.

## Affected

- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 7d60a4c49af4d5cb88aa7cbf998d0408bd415055`
- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < cd40eee4923d104ebec9ac7513b971bc441e431d`
- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 77d8efd04745cda23858546afdbd9d07b591758e`
- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea`
- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 376ee45659a4b943df672ad275c63da00655f929`
- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 4a1b39b2e10eb8de86265e80cf2be4396bc1dce4`
- `Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd`
- `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-2026-89616.json)