---
id: CVE-2025-21844
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: Add check for next_buffer in receive_encrypted_standard()

  Add check for the return value of cifs_buf_get() and cifs_small_buf_get()
  in receive_encrypted_s…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: Add check for next_buffer in receive_encrypted_standard()

  Add check for the return value of cifs_buf_get() and cifs_small_buf_get()
  in receive_encrypted_s…
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
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.1.69, < 6.1.130'
  - 'linux_kernel >= 6.6.8, < 6.6.80'
  - 'linux_kernel >= 6.7, < 6.12.17'
  - 'linux_kernel >= 6.13, < 6.13.5'
  - linux_kernel = 5.10.211
  - linux_kernel = 5.15.150
  - linux_kernel = 6.14
patched:
  - linux_kernel 6.13.5
published: '2025-03-12'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-21844'
references:
  - url: 'https://git.kernel.org/stable/c/24e8e4523d3071bc5143b0db9127d511489f7b3b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/554736b583f529ee159aa95af9a0cbc12b5ffc96'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/860ca5e50f73c2a1cef7eefc9d39d04e275417f7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9e5d99a4cf2e23c716b44862975548415fae5391'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a9b0b4b29877cb4dc5d0842b59b5ccbacddb85bd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f277e479eea3d1aa18bc712abe1d2bf3dece2e30'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f618aeb6cad2307e48a641379db610abcf593edf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00607
epssPercentile: 0.47749
ingestedAt: '2026-07-30T06:53:10.487Z'
---

## Overview

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

smb: client: Add check for next_buffer in receive_encrypted_standard()

Add check for the return value of cifs_buf_get() and cifs_small_buf_get()
in receive_encrypted_standard() to prevent null pointer dereference.

## Affected

- `linux_kernel >= 6.1.69, < 6.1.130`
- `linux_kernel >= 6.6.8, < 6.6.80`
- `linux_kernel >= 6.7, < 6.12.17`
- `linux_kernel >= 6.13, < 6.13.5`
- `linux_kernel = 5.10.211`
- `linux_kernel = 5.15.150`
- `linux_kernel = 6.14`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.13.5`