📄 Description (English)
An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.
🤖 AI Executive Summary
A critical out-of-bounds write vulnerability exists in X.Org X server and Xwayland's DRI buffer handling that allows local attackers to crash the display server or escalate privileges if running as root. The flaw affects systems using X11/Xwayland for graphical display, particularly in server environments. No patch is currently available, requiring immediate compensating controls and monitoring.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Jun 9, 2026 01:38
🇸🇦 Saudi Arabia Impact Assessment
High impact for Saudi government entities, research institutions, and data centers using Linux-based X11/Xwayland infrastructure. Critical for ARAMCO and energy sector facilities running X servers for SCADA/industrial control visualization. Significant risk for banking sector backend systems and NCA infrastructure if X11 is used for administrative access. Telecom operators (STC, Mobily) managing network infrastructure with X-based management tools face privilege escalation risks. Healthcare sector PACS systems and research institutions using X11 for medical imaging are vulnerable.
🏢 Affected Saudi Sectors
Government and Public Administration
Banking and Financial Services
Energy and Utilities (ARAMCO)
Telecommunications (STC, Mobily)
Healthcare and Medical Research
Defense and Security
Data Centers and Cloud Infrastructure
Research and Academic Institutions
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all systems running X.Org X server or Xwayland using: ps aux | grep -E 'X|Xwayland' and dpkg -l | grep xserver-xorg
2. Restrict local access to X server sockets (/tmp/.X11-unix/) with chmod 700 and verify socket permissions
3. Disable X11 forwarding in SSH if not required: edit /etc/ssh/sshd_config, set X11Forwarding no
4. Implement SELinux/AppArmor policies to restrict DRI buffer access
5. Monitor /var/log/Xvfb.log and /var/log/Xorg.log for crash patterns
COMPENSATING CONTROLS:
6. Run X server in restricted user context, never as root; use Xvfb with unprivileged user
7. Implement kernel-level protections: enable SMEP/SMAP, use ASLR (echo 2 > /proc/sys/kernel/randomize_va_space)
8. Deploy seccomp filters to restrict DRI2 syscalls if possible
9. Use containerization (Docker/Podman) to isolate X server instances
10. Implement strict access controls on /dev/dri/* devices
DETECTION:
11. Monitor for segmentation faults: grep 'segfault' /var/log/kern.log
12. Alert on X server crashes: monitor systemd journal for X service failures
13. Track DRI buffer allocation patterns using strace on X processes
14. Implement IDS rules for abnormal DRI2 protocol sequences
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل خادم X.Org أو Xwayland باستخدام: ps aux | grep -E 'X|Xwayland' و dpkg -l | grep xserver-xorg
2. تقييد الوصول المحلي إلى مقابس خادم X (/tmp/.X11-unix/) باستخدام chmod 700 والتحقق من أذونات المقبس
3. تعطيل إعادة توجيه X11 في SSH إذا لم تكن مطلوبة: عدّل /etc/ssh/sshd_config، اضبط X11Forwarding على no
4. تطبيق سياسات SELinux/AppArmor لتقييد الوصول إلى مخزن مؤقت DRI
5. مراقبة /var/log/Xvfb.log و /var/log/Xorg.log لأنماط الأعطال
الضوابط التعويضية:
6. تشغيل خادم X في سياق مستخدم مقيد، وليس أبداً كمسؤول؛ استخدم Xvfb مع مستخدم غير مميز
7. تطبيق الحماية على مستوى النواة: تفعيل SMEP/SMAP، استخدام ASLR (echo 2 > /proc/sys/kernel/randomize_va_space)
8. نشر مرشحات seccomp لتقييد استدعاءات DRI2 إن أمكن
9. استخدام الحاويات (Docker/Podman) لعزل مثيلات خادم X
10. تطبيق ضوابط وصول صارمة على أجهزة /dev/dri/*
الكشف:
11. مراقبة أخطاء التجزئة: grep 'segfault' /var/log/kern.log
12. تنبيه عند أعطال خادم X: مراقبة دفتر يوميات systemd لفشل خدمة X
13. تتبع أنماط تخصيص مخزن مؤقت DRI باستخدام strace على عمليات X
14. تطبيق قواعد IDS للتسلسلات غير العادية لبروتوكول DRI2
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies
ECC 2024 A.5.2.1 - User Registration and Access Rights Management
ECC 2024 A.8.1.1 - Information Security Awareness and Training
ECC 2024 A.12.2.1 - Change Management
ECC 2024 A.12.6.1 - Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory
SAMA CSF PR.AC-1 - Access Control Policy
SAMA CSF PR.PT-1 - Security Awareness and Training
SAMA CSF DE.CM-1 - System Monitoring
SAMA CSF RS.MI-1 - Incident Response Planning
🟡 ISO 27001:2022
ISO 27001:2022 A.5.1 - Policies for Information Security
ISO 27001:2022 A.5.2 - Information Security Roles and Responsibilities
ISO 27001:2022 A.6.1 - Screening
ISO 27001:2022 A.8.1 - Awareness and Training
ISO 27001:2022 A.12.6 - Management of Technical Vulnerabilities
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security Patches and Updates
PCI DSS 11.2 - Vulnerability Scanning
🔗 References & Sources 5
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https://access.redhat.com/security/cve/CVE-2026-50264
secalert@redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2485389
secalert@redhat.com
https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e95204...
secalert@redhat.com
https://lists.x.org/archives/xorg-announce/2026-June/003702.html
secalert@redhat.com
https://redhat.atlassian.net/browse/PSIRTSUPT-16950
secalert@redhat.com