---
id: CVE-2023-52479
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix uaf in smb20_oplock_break_ack

  drop reference after use opinfo.
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ksmbd: fix uaf in smb20_oplock_break_ack

  drop reference after use opinfo.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 5.15.135
  - 'linux_kernel >= 5.16, < 6.1.57'
  - 'linux_kernel >= 6.2, < 6.5.7'
  - linux_kernel = 6.6
patched:
  - linux_kernel 6.5.7
published: '2024-02-29'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-52479'
references:
  - url: 'https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00603
epssPercentile: 0.46596
ingestedAt: '2026-08-04T10:39:39.655Z'
---

## Overview

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

ksmbd: fix uaf in smb20_oplock_break_ack

drop reference after use opinfo.

## Affected

- `linux_kernel < 5.15.135`
- `linux_kernel >= 5.16, < 6.1.57`
- `linux_kernel >= 6.2, < 6.5.7`
- `linux_kernel = 6.6`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.5.7`