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CVE-2026-88812— X.Org Server XKB SetGeometry TextDoodad Double Free

Quick assessment

Affected
X.org xorg-x11-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 X.Org X Server 21.1.25 之前版本以及 X Wayland 24.1.14 之前版本中，XKB SetGeometry 函数存在双重释放漏洞。已连接的客户端可利用该漏洞导致服务器崩溃，或潜在地在 X 服务器上下文中执行任意代码。

CVSS 7.8 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
X.org xorg-x11-server < 21.1.25 affected
x.org xwayland < 24.1.14 affected
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I. Basic Information for CVE-2026-88812

Vulnerability Information
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Vulnerability Title
X.Org Server XKB SetGeometry TextDoodad Double Free
Source: CVE Program / CVE List V5
Vulnerability Description
A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
X.org xorg-x11-server 0 ~ 21.1.25 -
x.org xwayland 0 ~ 24.1.14 -

II. Public POCs for CVE-2026-88812

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-88812

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Other References for CVE-2026-88812 (1)

Same Patch Batch · X.org · 2026-10-27 · 4 CVEs total

CVE-2026-109089 7.5 HIGH libXi XGetDeviceControl Control Type Mismatch Heap Buffer Overflow
CVE-2026-109090 7.5 HIGH libXi XGetDeviceControl DEVICE_ENABLE Heap Buffer Overflow
CVE-2026-109088 6.5 MEDIUM libXtst RECORD EnableContext Reply Endless Loop

IV. Related Vulnerabilities

Same product: xorg-x11-server
Same vendor: X.org
Same weakness: CWE-415