---
id: "CVE-2026-109903"
page: "https://infrastack.ai/live/CVE-2026-109903"
kind: "vulnerability"
aliases: ["CVE-2026-109903"]
title: "X.Org X Server: buffer overread in XvQueryImageAttributes crashes the server"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["desktop", "infrastructure", "linux", "x.org", "xwayland"]
not_affected_if: ["no-x-clients", "wayland-only"]
published_at: "2026-11-13T11:17:14+00:00"
first_seen_at: "2026-11-13T11:44:16+00:00"
updated_at: "2026-11-13T11:44:31+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109903", "first_seen_at": "2026-11-13T11:44:16+00:00"}]
exploit_sources: []
---

# X.Org X Server: buffer overread in XvQueryImageAttributes crashes the server

Link for people: https://infrastack.ai/live/CVE-2026-109903 (this .md is for agents)

A negative integer cast to CARD32 in XvQueryImageAttributes causes a buffer overread in X.Org X Server before 21.1.26 and Xwayland before 24.1.15. An authenticated X client can use it to crash the server.

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

## How to check

- Run `Xorg -version` or `X -version` and compare against `21.1.26`.
- For Xwayland, run `Xwayland -version` and compare against `24.1.15`.

## Fix

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

## Timeline

- 2026-11-13T11:44:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109903

## From the sources

A buffer overread caused by casting a negative integer to CARD32 in XvQueryImageAttributes in X.Org X Server before 21.1.26 and xwayland before 24.1.15 could be used to causes crashes by authenticated X clients.

---

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