---
id: CVE-2026-64384
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix change notify replay double-free

  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 change notify replay double-free

  A response-bearing attempt can return a replayable error and free its
  response buffer. If SMB2_notify_init() fails be…
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-2026-64384'
references:
  - url: 'https://git.kernel.org/stable/c/145f820dcbb2cced374f2532f8a61a44dce4a615'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64384.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-64384'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507287'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64384'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64384'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026072526-CVE-2026-64384-a6b7@gregkh/T
  - url: 'https://access.redhat.com/errata/RHSA-2026:61887'
  - url: 'https://access.redhat.com/errata/RHSA-2026:64808'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00457
epssPercentile: 0.38989
ingestedAt: '2026-07-27T06:16:51.039Z'
vendor: Red Hat
product: Red Hat Enterprise Linux BaseOS (v. 10)
affected:
  - enterprise_linux 9
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_real_time_for_nfv_v_10
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_real_time_v_10
  - enterprise_linux_real_time_v_9
patched:
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_real_time_for_nfv_v_10
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_real_time_v_10
  - enterprise_linux_real_time_v_9
cwe:
  - CWE-1341
scores:
  nvd: 9.8
  vendor: 7
---

## Overview

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

smb: client: fix change notify replay double-free

A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_notify_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

- **RHSA-2026:61887** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:61887)
- **RHSA-2026:64808** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64808)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64384.json)