---
id: CVE-2025-21748
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix integer overflows on 32 bit systems

  On 32bit systems the addition operations in ipc_msg_alloc() can
  potentially overflow leading to memory corruption.
  Add b…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix integer overflows on 32 bit systems

  On 32bit systems the addition operations in ipc_msg_alloc() can
  potentially overflow leading to memory corruption.
  Add b…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.15, < 6.1.129'
  - 'linux_kernel >= 6.2, < 6.6.78'
  - 'linux_kernel >= 6.7, < 6.12.14'
  - 'linux_kernel >= 6.13, < 6.13.3'
patched:
  - linux_kernel 6.13.3
published: '2025-02-27'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-21748'
references:
  - url: 'https://git.kernel.org/stable/c/760568c1f62ea874e8fb492f9cfa4f47b4b8391e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/82f59d64e6297f270311b16b5dcf65be406d1ea3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aab98e2dbd648510f8f51b83fbf4721206ccae45'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b4b902737746c490258de5cb55cab39e79927a67'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ecb9947fa7c99a77b04d43404c6988a0d326e4a0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f3b9fb2764591d792d160f375851013665a9e820'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00606
epssPercentile: 0.46661
ingestedAt: '2026-07-30T06:53:09.623Z'
---

## Overview

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

ksmbd: fix integer overflows on 32 bit systems

On 32bit systems the addition operations in ipc_msg_alloc() can
potentially overflow leading to memory corruption.
Add bounds checking using KSMBD_IPC_MAX_PAYLOAD to avoid overflow.

## Affected

- `linux_kernel >= 5.15, < 6.1.129`
- `linux_kernel >= 6.2, < 6.6.78`
- `linux_kernel >= 6.7, < 6.12.14`
- `linux_kernel >= 6.13, < 6.13.3`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.13.3`