---
id: CVE-2025-22039
title: 'ksmbd: fix overflow in dacloffset bounds check'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix overflow in dacloffset bounds check

  The dacloffset field was originally typed as int and used in an
  unchecked addition, which could overflow and bypass the …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    abbb4ec41867f2cd1c971258e493893bf43bcbd3
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    8483d7b532be1d1bc149556a2fedf903868c6303
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    73f074fb5e139cd42ad75089abe4e28a49a30003
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    6b8d379048b168a0dff5ab1acb975b933f368514
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    443b373a4df5a2cb9f7b8c4658b2afedeb16397f
  - >-
    Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf <
    beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42
  - Linux 5.15
published: '2025-04-16'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T11:57:53.618Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-22039'
references:
  - url: 'https://git.kernel.org/stable/c/abbb4ec41867f2cd1c971258e493893bf43bcbd3'
  - url: 'https://git.kernel.org/stable/c/8483d7b532be1d1bc149556a2fedf903868c6303'
  - url: 'https://git.kernel.org/stable/c/73f074fb5e139cd42ad75089abe4e28a49a30003'
  - url: 'https://git.kernel.org/stable/c/6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc'
  - url: 'https://git.kernel.org/stable/c/6b8d379048b168a0dff5ab1acb975b933f368514'
  - url: 'https://git.kernel.org/stable/c/443b373a4df5a2cb9f7b8c4658b2afedeb16397f'
  - url: 'https://git.kernel.org/stable/c/beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42'
tags:
  - cve.org
epss: 0.00775
epssPercentile: 0.53957
ingestedAt: '2026-09-14T15:23:07.460Z'
---

## Overview

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

ksmbd: fix overflow in dacloffset bounds check

The dacloffset field was originally typed as int and used in an
unchecked addition, which could overflow and bypass the existing
bounds check in both smb_check_perm_dacl() and smb_inherit_dacl().

This could result in out-of-bounds memory access and a kernel crash
when dereferencing the DACL pointer.

This patch converts dacloffset to unsigned int and uses
check_add_overflow() to validate access to the DACL.

## Affected

- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < abbb4ec41867f2cd1c971258e493893bf43bcbd3`
- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 8483d7b532be1d1bc149556a2fedf903868c6303`
- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 73f074fb5e139cd42ad75089abe4e28a49a30003`
- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc`
- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 6b8d379048b168a0dff5ab1acb975b933f368514`
- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 443b373a4df5a2cb9f7b8c4658b2afedeb16397f`
- `Linux >= 0626e6641f6b467447c81dd7678a69c66f7746cf < beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42`
- `Linux 5.15`

## Remediation

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