---
id: CVE-2026-64383
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix double-free in SMB2_flush() replay

  SMB2_flush() keeps its response buffer bookkeeping across replay
  attempts
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix double-free in SMB2_flush() replay

  SMB2_flush() keeps its response buffer bookkeeping across replay
  attempts. If a replayable flush response is receiv…
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'
published: '2026-07-25'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64383'
references:
  - url: 'https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adaf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00457
epssPercentile: 0.37022
ingestedAt: '2026-07-27T06:16:51.014Z'
---

## Overview

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

smb: client: fix double-free in SMB2_flush() replay

SMB2_flush() keeps its response buffer bookkeeping across replay
attempts. If a replayable flush response is received and the retry then
fails before cifs_send_recv() stores a replacement response, flush_exit
will free the stale response pointer a second time.

Reinitialize resp_buftype and rsp_iov at the top of the replay loop so
cleanup only acts on response state produced by the current attempt.
This fixes a double-free without changing replay handling for successful
requests.

## Remediation

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