---
id: CVE-2026-98681
title: 'smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races

  The invalidHandle, swapfile, oplock_break_cancelled, offload,
  and status_file_deleted fields a…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 <
    3786ee67658a2c80fef2544e7de2cd329e043cf9
  - >-
    Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 <
    4165641d06ef44f3a31b77a28048b6c737e885e7
  - >-
    Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 <
    d9d23d115610e0342e768f6cb525d91c7b154027
  - >-
    Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 <
    19465a9aeb664f1d710d0d22c07c31bfb7c85446
  - Linux 2.6.32
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:45:45.654Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98681'
references:
  - url: 'https://git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9'
  - url: 'https://git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7'
  - url: 'https://git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027'
  - url: 'https://git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.529Z'
---

## Overview

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

smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races

The invalidHandle, swapfile, oplock_break_cancelled, offload,
and status_file_deleted fields are stored in the same bitfield byte
in struct cifsFileInfo, but are updated in different code paths that
may run simultaneously, and are protected by different locks.  Since
bitfield assignments generate byte-level read-modify-write operations,
a modification to one flag can overwrite a concurrent modification to
another flag.

To avoid these races, convert these flags from a bitfield to
separate bool fields.

## Affected

- `Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 < 3786ee67658a2c80fef2544e7de2cd329e043cf9`
- `Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 < 4165641d06ef44f3a31b77a28048b6c737e885e7`
- `Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 < d9d23d115610e0342e768f6cb525d91c7b154027`
- `Linux >= 3bc303c254335dbd7c7012cc1760b12f1d5514d3 < 19465a9aeb664f1d710d0d22c07c31bfb7c85446`
- `Linux 2.6.32`

## Remediation

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