---
id: CVE-2026-89779
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs/ntfs3: validate ef->size covers the record's name and value

  When an EA record has a non-zero ef->size, ntfs_read_ea() only checks
  that the record fits in the remain…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  fs/ntfs3: validate ef->size covers the record's name and value

  When an EA record has a non-zero ef->size, ntfs_read_ea() only checks
  that the record fits in the remain…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 333feb7ba84f69f9b423422417aaac54fd9e7c84 <
    b27e68ad818a4ca2cef8f35f97e75d756714c818
  - >-
    Linux >= 000a9a72efa4a9df289bab9c9e8ba1639c72e0d6 <
    28a924c7e67e6d71abeb04860b61166fecb027fc
  - >-
    Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <
    d585ed08308909c7e6fefb4e8a258aeb29b19ff9
  - >-
    Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <
    077df8464cf24f8ffc82fb6efec2ae600686e699
  - >-
    Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <
    aab1880058ac767d3ea9388a9a7221c776c22c44
  - >-
    Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <
    c8a109c9e23a2c7fd548473dde728b2cb8188146
  - >-
    Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <
    c22f91d82cb9a29d22bdffdce6c803467984ad0c
  - Linux >= 5.15.121 < 5.15.221
  - Linux >= 6.1.40 < 6.1.188
  - Linux 6.2
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:07.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89779'
references:
  - url: 'https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T08:52:29.594Z'
epss: 0.00688
epssPercentile: 0.51316
---

## Overview

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

fs/ntfs3: validate ef->size covers the record's name and value

When an EA record has a non-zero ef->size, ntfs_read_ea() only checks
that the record fits in the remaining buffer (ea_size > bytes), not that
ef->size is large enough to hold the record's own name_len + 1 + elength.

A crafted image can pass validation with, e.g., ef->size = 24 but
elength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of
the undersized record, reading past the kmalloc(info->size) allocation
and leaking heap memory to userspace via getxattr():

 BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)
 Read of size 65535 at addr ffff888100794550 by task exploit
  __asan_memcpy (mm/kasan/shadow.c:105)
  ntfs_get_ea (fs/ntfs3/xattr.c:302)
  ntfs_getxattr (fs/ntfs3/xattr.c:848)
  __vfs_getxattr (fs/xattr.c:441)
  vfs_getxattr (fs/xattr.c:474)
  do_getxattr (fs/xattr.c:800)
  path_getxattrat (fs/xattr.c:868)
  do_syscall_64 (arch/x86/entry/syscall_64.c:94)

 The buggy address is located 80 bytes inside of
  allocated 84-byte region in cache kmalloc-96

Compute the size the record needs and require ef->size to cover it.

## Remediation

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