---
id: CVE-2025-22037
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix null pointer dereference in alloc_preauth_hash()

  The Client send malformed smb2 negotiate request
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix null pointer dereference in alloc_preauth_hash()

  The Client send malformed smb2 negotiate request. ksmbd return error
  response. Subsequently, the client can…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.6, < 6.6.107'
  - 'linux_kernel >= 6.12, < 6.12.23'
  - 'linux_kernel >= 6.13, < 6.13.11'
  - 'linux_kernel >= 6.14, < 6.14.2'
patched:
  - linux_kernel 6.14.2
published: '2025-04-16'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T00:46:56.740'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-22037'
references:
  - url: 'https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://www.zerodayinitiative.com/advisories/ZDI-25-310/'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.69566
epssPercentile: 0.99351
zeroDay: true
ingestedAt: '2026-10-08T01:01:40.722Z'
---

## Overview

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

ksmbd: fix null pointer dereference in alloc_preauth_hash()

The Client send malformed smb2 negotiate request. ksmbd return error
response. Subsequently, the client can send smb2 session setup even
thought conn->preauth_info is not allocated.
This patch add KSMBD_SESS_NEED_SETUP status of connection to ignore
session setup request if smb2 negotiate phase is not complete.

## Affected

- `linux_kernel >= 6.6, < 6.6.107`
- `linux_kernel >= 6.12, < 6.12.23`
- `linux_kernel >= 6.13, < 6.13.11`
- `linux_kernel >= 6.14, < 6.14.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.14.2`