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CVE-2026-93520— X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

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 2.1.25 之前版本以及 XWayland 24.1.14 之前版本中，由于与之间的尺寸计算不匹配，导致堆缓冲区溢出漏洞。该漏洞可被已认证的 X 客户端利用，致使 X 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 Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client Execution

Affected Version Matrix 2

Vendor	Product	Version Range	Status
x.org	xorg-x11-server	`< 21.1.25`	affected
x.org	xwayland	`< 24.1.14`	affected

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Vulnerability Information

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Vulnerability Title

X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

Source: CVE Program / CVE List V5

Vulnerability Description

A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 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.org	xwayland	0 ~ 24.1.14	-

II. Public POCs for CVE-2026-93520

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-93520

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Patches & Fixes for CVE-2026-93520 (1)

🔗 Verification Required patch

https://www.cve.org/CVERecord?id=CVE-2026-93520

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-2026-93519	7.8 HIGH	X.Org Server XFixes Pointer Barrier Event List Buffer Overflow
CVE-2026-93521	7.8 HIGH	X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow
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