---
id: "CVE-2026-109094"
page: "https://infrastack.ai/live/CVE-2026-109094"
kind: "vulnerability"
aliases: ["CVE-2026-109094"]
title: "X.Org X Server: integer overflow lets a client crash the display server"
severity: "high"
cvss: 8.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["32-bit", "infrastructure", "linux-desktop", "x.org", "xwayland"]
not_affected_if: ["64-bit-systems", "no-x-clients", "patched-release"]
published_at: "2026-11-13T15:17:30+00:00"
first_seen_at: "2026-11-13T15:46:15+00:00"
updated_at: "2026-11-13T15:48:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109094", "first_seen_at": "2026-11-13T15:46:15+00:00"}]
exploit_sources: []
---

# X.Org X Server: integer overflow lets a client crash the display server

Link for people: https://infrastack.ai/live/CVE-2026-109094 (this .md is for agents)

An integer overflow in the XRes extension's QueryResourceBytes swap path causes an out-of-bounds read in X.Org xwayland before 24.1.15 and X Server before 21.1.26 on 32-bit systems. An authenticated client can use it to crash the X server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `Xorg -version` or `Xwayland -version` and compare the version to the fixed releases.
- Check whether the system is 32-bit (for example with `uname -m`).

## Fix

- X Server: move to `21.1.26` or later.
- xwayland: move to `24.1.15` or later.

## Timeline

- 2026-11-13T15:46:15+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109094

## From the sources

A integer overflow that can lead to a buffer overrread in the XRes QueryResourceBytes Swap Path in the X.Org xwayland before 24.1.15 and X Server before 21.1.26 on 32bit systems could be used by authenticated clients to crash the X server.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_