---
id: CVE-2023-32256
title: A flaw was found in the Linux kernel's ksmbd component
summary: >-
  A flaw was found in the Linux kernel's ksmbd component. A race condition
  between smb2 close operation and logoff in multichannel connections could
  result in a use-after-free issue.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:H'
cwe:
  - CWE-421
published: '2025-08-01'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-32256'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2023-32256'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2385885'
    label: secalert@redhat.com
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abcc506a9a71976a8b4c9bf3ee6efd13229c1e19
    label: secalert@redhat.com
  - url: 'https://www.zerodayinitiative.com/advisories/ZDI-23-704/'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00531
epssPercentile: 0.42369
zeroDay: true
ingestedAt: '2026-06-29T13:24:34.403Z'
---

## Overview

A flaw was found in the Linux kernel's ksmbd component. A race condition between smb2 close operation and logoff in multichannel connections could result in a use-after-free issue.

## Remediation

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