---
id: CVE-2023-5574
title: A use-after-free flaw was found in xorg-x11-server-Xvfb
summary: >-
  A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in
  Xvfb with a very specific and legacy configuration (a multi-screen setup with
  multiple protocol screens, also known as Zaphod mode). If the pointer is
  warped f…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
  - CWE-416
vendor: x.org
product: x_server
affected:
  - x_server >= 1.13.0
  - enterprise_linux = 7.0
published: '2023-10-25'
updated: '2026-06-23'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-5574'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:2298'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2023-5574'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2244735'
    label: secalert@redhat.com
  - url: 'https://lists.x.org/archives/xorg-announce/2023-October/003430.html'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:2298'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/CVE-2023-5574'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2244735'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.x.org/archives/xorg-announce/2023-October/003430.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20231130-0004/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00621
epssPercentile: 0.48442
ingestedAt: '2026-06-29T13:24:33.917Z'
---

## Overview

A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.

## Affected

- `x_server >= 1.13.0`
- `enterprise_linux = 7.0`

## Remediation

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