---
id: CVE-2026-64385
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix double-free in SMB2_ioctl() replay

  A response-bearing attempt can return a replayable error and free its
  response buffer
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix double-free in SMB2_ioctl() replay

  A response-bearing attempt can return a replayable error and free its
  response buffer. If SMB2_ioctl_init() fails 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'
published: '2026-07-25'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64385'
references:
  - url: 'https://git.kernel.org/stable/c/0be4bc64882edaefaaee8d1e27d083643eb778e6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64385.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-64385'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507035'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64385'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64385'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026072526-CVE-2026-64385-80b2@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00457
epssPercentile: 0.38991
ingestedAt: '2026-07-27T07:17:00.939Z'
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
cwe:
  - CWE-1341
scores:
  nvd: 9.8
  vendor: 7
---

## Overview

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

smb: client: fix double-free in SMB2_ioctl() replay

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_ioctl_init() fails before the next send, cleanup
retains the previous buffer type and frees that response again.

Reset response bookkeeping before each attempt to prevent the stale free.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64385.json)