CVE-2026-93519— X.Org Server XFixes Pointer Barrier Event List Buffer Overflow

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 服务器（21.1.25 之前版本）和 XWayland（24.1.14 之前版本）中，处理 XFIXES 扩展中的指针屏障时存在缓冲区溢出漏洞。已认证的 X 客户端可利用该漏洞导致 X 服务器崩溃，或可能在 X 服务器上下文中执行代码。

CVSS 7.8 · High Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

X.Org Server XFixes Pointer Barrier Event List Buffer Overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in 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

堆缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-93519

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-93519

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Other References for CVE-2026-93519 (1)

https://gitlab.freedesktop.org/xorg/xserver/-/commit/1f42cc1f00d9c6d46978ae82dba8a52f4d902369 patch

https://www.cve.org/CVERecord?id=CVE-2026-93519

Same Patch Batch · x.org · 2026-10-28 · 10 CVEs total

CVE-2026-93518	7.8 HIGH	X.Org Server XKB ResizeKeyType Numeric Truncation
CVE-2026-93521	7.8 HIGH	X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow
CVE-2026-93520	7.8 HIGH	X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write
CVE-2026-93522	7.8 HIGH	X.Org Server Glamor CopyArea Heap Buffer Overflow
CVE-2026-93523	7.8 HIGH	X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write
CVE-2026-93524	6.9 MEDIUM	X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read
CVE-2026-93515	6.8 MEDIUM	.Org Server Present Extension Use-After-Free
CVE-2026-93516	5.5 MEDIUM	.Org Server XInput Passive Grab Use-After-Free
CVE-2026-93536	5.3 MEDIUM	X.Org Server GestureBuildSprite Use-After-Free

IV. Related Vulnerabilities

Same product: xorg-x11-server

Same vendor: x.org

Same weakness: CWE-122