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CVE-2026-93523— X.Org Server XInput2 PassiveUngrabDevice 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 Server 21.1.15 之前版本以及 XWayland 24.1.14 之前版本中，由于 XIPassiveUngrabDevice 请求中使用了超出范围的修饰符（modifier）值，导致堆缓冲区溢出。已认证的 X 客户端可利用此漏洞，导致 X 服务器崩溃，或潜在地在 X 服务器上下文中执行代码。

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-2026-93523

Vulnerability Information
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Vulnerability Title
X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write
Source: CVE Program / CVE List V5
Vulnerability Description
A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 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-2026-93523

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-93523

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Patches & Fixes for CVE-2026-93523 (1)

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-2026-93520 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-2026-93524 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