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Vulnerabilities

CVE-2026-50257

High
CWE-416 — Weakness Type
Published: Jun 5, 2026  ·  Modified: Jun 10, 2026  ·  Source: NVD
CVSS v3
7.8
🔗 NVD Official
📄 Description (English)

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.

🤖 AI Executive Summary

A use-after-free vulnerability in X.Org X server and Xwayland's miSyncDestroyFence() function allows attackers to crash the server or escalate privileges by manipulating fence triggers through multiple client connections. The flaw requires local access to the X server and can be exploited when the server runs with elevated privileges.

📄 Description (Arabic)

تم اكتشاف ثغرة استخدام الذاكرة بعد التحرير في دالة miSyncDestroyFence() في خادم X.Org X و Xwayland. يمكن لمهاجم محلي استغلال هذه الثغرة من خلال إنشاء عدة اتصالات عميل لتعيين وتدمير حواجز المزامنة، مما يؤدي إلى استدعاء مؤشر دالة غير صحيح. قد يؤدي هذا إلى توقف الخادم أو تصعيد الامتيازات إذا كان الخادم يعمل بصلاحيات جذر.

🤖 ملخص تنفيذي (AI)

A use-after-free vulnerability in X.Org X server and Xwayland's miSyncDestroyFence() function allows attackers to crash the server or escalate privileges by manipulating fence triggers through multiple client connections. The flaw requires local access to the X server and can be exploited when the server runs with elevated privileges.

🤖 AI Intelligence Analysis Analyzed: Jun 9, 2026 01:34
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
government energy telecom healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.0
/ 10.0
🔧 Remediation Steps (English)
Update X.Org X server and Xwayland to patched versions immediately. Restrict local access to X server sockets, disable X11 forwarding if not required, run X server with minimal privileges (non-root), and implement access controls on /tmp/.X11-unix sockets.
🔧 خطوات المعالجة (العربية)
قم بتحديث خادم X.Org X و Xwayland إلى الإصدارات المصححة فوراً. قيد الوصول المحلي إلى مقابس خادم X، وعطل إعادة توجيه X11 إذا لم تكن مطلوبة، وقم بتشغيل خادم X بأقل الامتيازات (غير جذر)، وطبق عناصر تحكم في الوصول على مقابس /tmp/.X11-unix.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.12.6.1 A.14.2.1
🔵 SAMA CSF
ID.AM-2 PR.DS-1 PR.PT-1
🟡 ISO 27001:2022
27001:A.12.6.1 27001:A.14.2.1 27001:A.12.2.1
📦 Affected Products / CPE 6 entries
x.org:x_server
x.org:xwayland
redhat:enterprise_linux:7.0
redhat:enterprise_linux:8.0
redhat:enterprise_linux:9.0
redhat:enterprise_linux:10.0
📊 CVSS Score
7.8
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.8
CWECWE-416
EPSS0.01%
Exploit No
Patch ✓ Yes
Published 2026-06-05
Source Feed nvd
Views 1
🇸🇦 Saudi Risk Score
8.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
patch-available CWE-416
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