---
id: "CVE-2026-109096"
page: "https://infrastack.ai/live/CVE-2026-109096"
kind: "vulnerability"
aliases: ["CVE-2026-109096"]
title: "X.Org X Server: negative return handling lets an authenticated client crash the server"
severity: "medium"
cvss: 5.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "linux", "x.org", "xserver", "xwayland"]
not_affected_if: ["no-x-server", "trusted-clients-only"]
published_at: "2026-11-13T14:17:47+00:00"
first_seen_at: "2026-11-13T15:19:48+00:00"
updated_at: "2026-11-13T15:21:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109096", "first_seen_at": "2026-11-13T15:19:48+00:00"}]
exploit_sources: []
---

# X.Org X Server: negative return handling lets an authenticated client crash the server

Link for people: https://infrastack.ai/live/CVE-2026-109096 (this .md is for agents)

A bug in how X.Org X Server and Xwayland handle a negative return from ddQueryImageAttributes() during XvPutImage requests. An authenticated X client can send a crafted request 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` to read the installed version.
- Check whether the installed X Server is earlier than `21.1.26` or Xwayland is earlier than `24.1.15`.

## Fix

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

## Timeline

- 2026-11-13T15:19:48+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109096

## From the sources

Incorrect handling of negative returns from ddQueryImageAttributes()  when processing XvPutImage requests in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by authenticated X clients to crash the X server.

---

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