---
title: "CVE-2026-88812: X.Org X Server - Use After Free"
description: "X.Org X Server < 21.1.25 and X Wayland < 24.1.14 contain a double free vulnerability in XKB SetGeometry, letting attached clients cause a crash or potentially execute code in the server context, exploit requires client attachment."
url: https://panop.io/threat-heartbeat/CVE-2026-88812/
---

# CVE-2026-88812 X.Org X Server - Use After Free

X.Org X Server < 21.1.25 and X Wayland < 24.1.14 contain a double free vulnerability in XKB SetGeometry, letting attached clients cause a crash or potentially execute code in the server context, exploit requires client attachment.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.19% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-88812)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-415](https://cwe.mitre.org/data/definitions/415.html)

## Vendor fix

Update to X.Org X Server 21.1.25 or later and X Wayland 24.1.14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-88812](https://nvd.nist.gov/vuln/detail/CVE-2026-88812)
- [https://gitlab.freedesktop.org/xorg/xserver/-/commit/0d1b1b0bad86c9ea2a3b7ca5a70e681dc69f1ecc](https://gitlab.freedesktop.org/xorg/xserver/-/commit/0d1b1b0bad86c9ea2a3b7ca5a70e681dc69f1ecc)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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