---
id: CVE-2024-0229
title: >-
  Xorg-x11-server: reattaching to different master device may lead to
  out-of-bounds memory access
summary: >-
  An out-of-bounds memory access flaw was found in the X.Org server. This issue
  can be triggered when a device frozen by a sync grab is reattached to a
  different master device. This issue may lead to an application crash, local
  privilege e…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: Red Hat
product: xorg-server
affected:
  - xorg-server >= 21.1.0 < 21.1.11
  - tigervnc (all versions)
  - xorg-x11-server (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - xorg-x11-server (all versions)
  - xorg-x11-server-Xwayland (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - xorg-x11-server (all versions)
  - xorg-x11-server-Xwayland (all versions)
  - tigervnc (all versions)
  - tigervnc (all versions)
  - xorg-x11-server
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2024-02-12T16:50:56.761255Z'
published: '2024-02-09'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T21:07:33.035Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-0229'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:0320'
    label: 'RHSA-2024:0320'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0557'
    label: 'RHSA-2024:0557'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0558'
    label: 'RHSA-2024:0558'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0597'
    label: 'RHSA-2024:0597'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0607'
    label: 'RHSA-2024:0607'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0614'
    label: 'RHSA-2024:0614'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0617'
    label: 'RHSA-2024:0617'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0621'
    label: 'RHSA-2024:0621'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0626'
    label: 'RHSA-2024:0626'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0629'
    label: 'RHSA-2024:0629'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2169'
    label: 'RHSA-2024:2169'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2170'
    label: 'RHSA-2024:2170'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2995'
    label: 'RHSA-2024:2995'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2996'
    label: 'RHSA-2024:2996'
  - url: 'https://access.redhat.com/errata/RHSA-2025:12751'
    label: 'RHSA-2025:12751'
  - url: 'https://access.redhat.com/security/cve/CVE-2024-0229'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2256690'
    label: RHBZ#2256690
tags:
  - cve.org
epss: 0.01229
epssPercentile: 0.68991
ingestedAt: '2026-11-05T21:36:00.595Z'
---

## Overview

An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a device frozen by a sync grab is reattached to a different master device. This issue may lead to an application crash, local privilege escalation (if the server runs with extended privileges), or remote code execution in SSH X11 forwarding environments.

## Affected

- `xorg-server >= 21.1.0 < 21.1.11`
- `tigervnc (all versions)`
- `xorg-x11-server (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `xorg-x11-server (all versions)`
- `xorg-x11-server-Xwayland (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `xorg-x11-server (all versions)`
- `xorg-x11-server-Xwayland (all versions)`
- `tigervnc (all versions)`
- `tigervnc (all versions)`
- `xorg-x11-server`

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.