---
id: CVE-2024-26692
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: Fix regression in writes when non-standard maximum write size negotiated

  The conversion to netfs in the 6.3 kernel caused a regression when
  maximum write size is …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: Fix regression in writes when non-standard maximum write size negotiated

  The conversion to netfs in the 6.3 kernel caused a regression when
  maximum write size is …
severity: high
cvss: 8.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H'
cwe:
  - CWE-787
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.3, < 6.6.18'
  - 'linux_kernel >= 6.7, < 6.7.6'
  - linux_kernel = 6.8
patched:
  - linux_kernel 6.7.6
published: '2024-04-03'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-26692'
references:
  - url: 'https://git.kernel.org/stable/c/4145ccff546ea868428b3e0fe6818c6261b574a9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4860abb91f3d7fbaf8147d54782149bb1fc45892'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/63c35afd50e28b49c5b75542045a8c42b696dab9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4145ccff546ea868428b3e0fe6818c6261b574a9'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/4860abb91f3d7fbaf8147d54782149bb1fc45892'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/63c35afd50e28b49c5b75542045a8c42b696dab9'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00528
epssPercentile: 0.42302
ingestedAt: '2026-08-05T10:46:48.018Z'
---

## Overview

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

smb: Fix regression in writes when non-standard maximum write size negotiated

The conversion to netfs in the 6.3 kernel caused a regression when
maximum write size is set by the server to an unexpected value which is
not a multiple of 4096 (similarly if the user overrides the maximum
write size by setting mount parm "wsize", but sets it to a value that
is not a multiple of 4096).  When negotiated write size is not a
multiple of 4096 the netfs code can skip the end of the final
page when doing large sequential writes, causing data corruption.

This section of code is being rewritten/removed due to a large
netfs change, but until that point (ie for the 6.3 kernel until now)
we can not support non-standard maximum write sizes.

Add a warning if a user specifies a wsize on mount that is not
a multiple of 4096 (and round down), also add a change where we
round down the maximum write size if the server negotiates a value
that is not a multiple of 4096 (we also have to check to make sure that
we do not round it down to zero).

## Affected

- `linux_kernel >= 6.3, < 6.6.18`
- `linux_kernel >= 6.7, < 6.7.6`
- `linux_kernel = 6.8`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.7.6`