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CVE-2026-93524— X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read

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 之前以及 XWayland 24.1.14 之前的 函数中存在缓冲区过度读取漏洞。已认证的 X 客户端可利用该漏洞泄露 X 服务器内存中的少量信息，或可能导致 X 服务器崩溃。

CVSS 6.9 · Medium

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-2026-93524

Vulnerability Information
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Vulnerability Title
X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read
Source: CVE Program / CVE List V5
Vulnerability Description
A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
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-2026-93524

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-93524

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Patches & Fixes for CVE-2026-93524 (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-2026-93523 7.8 HIGH X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write
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-126