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Vulnerabilities

CVE-2026-23665

High
Heap-based buffer overflow in Azure Linux Virtual Machines allows an authorized attacker to elevate privileges locally.
CWE-122 — Weakness Type
Published: Mar 10, 2026  ·  Modified: Mar 17, 2026  ·  Source: NVD
CVSS v3
7.8
🔗 NVD Official
📄 Description (English)

Heap-based buffer overflow in Azure Linux Virtual Machines allows an authorized attacker to elevate privileges locally.

🤖 AI Executive Summary

CVE-2026-23665 is a heap-based buffer overflow vulnerability in Azure Linux Virtual Machines that allows authenticated local attackers to escalate privileges. With a CVSS score of 7.8, this vulnerability poses a significant risk to organizations running Linux workloads on Azure infrastructure. While no public exploit is currently available, the vulnerability requires immediate patching to prevent potential privilege escalation attacks.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 29, 2026 00:26
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi organizations leveraging Azure cloud infrastructure, particularly in banking (SAMA-regulated institutions), government agencies (NCA oversight), healthcare providers, and energy sector organizations. Saudi financial institutions and government entities using Azure Linux VMs for critical workloads face elevated privilege escalation risks. Telecom operators (STC, Mobily) and enterprises with hybrid cloud deployments are particularly vulnerable. The local authentication requirement limits exposure but remains critical for multi-tenant environments and insider threat scenarios.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Healthcare and Medical Services Energy and Utilities Telecommunications Enterprise and Cloud Services
⚖️ Saudi Risk Score (AI)
7.8
/ 10.0
🔧 Remediation Steps (English)
1. IMMEDIATE ACTIONS:
- Inventory all Azure Linux Virtual Machines across your organization
- Prioritize patching for systems in critical infrastructure (banking, government, healthcare, energy)
- Restrict local access to Azure VMs to authorized personnel only
- Review and strengthen access controls for service accounts

2. PATCHING GUIDANCE:
- Apply Microsoft security updates for Azure Linux VMs immediately
- Test patches in non-production environments first
- Schedule maintenance windows for production systems
- Verify patch application using Azure Update Management or equivalent tools

3. COMPENSATING CONTROLS (if patching delayed):
- Implement strict local access controls and multi-factor authentication
- Deploy endpoint detection and response (EDR) solutions on Linux VMs
- Monitor for suspicious privilege escalation attempts
- Implement application whitelisting to prevent unauthorized binary execution
- Use Azure Policy to enforce security baselines

4. DETECTION RULES:
- Monitor for unexpected privilege escalation attempts in system logs
- Alert on unusual heap memory access patterns
- Track failed and successful sudo/su command executions
- Monitor for exploitation indicators: segmentation faults, core dumps, abnormal process behavior
- Implement auditd rules to log all privilege escalation attempts
🔧 خطوات المعالجة (العربية)
1. الإجراءات الفورية:
- قم بحصر جميع أجهزة Azure Linux الافتراضية عبر مؤسستك
- أولويات التصحيح للأنظمة في البنية التحتية الحرجة (البنوك والحكومة والرعاية الصحية والطاقة)
- تقييد الوصول المحلي إلى أجهزة Azure للموظفين المصرح لهم فقط
- مراجعة وتعزيز عناصر التحكم في الوصول لحسابات الخدمة

2. إرشادات التصحيح:
- تطبيق تحديثات أمان Microsoft لأجهزة Azure Linux على الفور
- اختبار التصحيحات في بيئات غير الإنتاج أولاً
- جدولة نوافذ الصيانة للأنظمة الإنتاجية
- التحقق من تطبيق التصحيح باستخدام Azure Update Management أو أدوات مكافئة

3. عناصر التحكم البديلة (إذا تأخر التصحيح):
- تنفيذ عناصر تحكم وصول محلية صارمة والمصادقة متعددة العوامل
- نشر حلول كشف الاستجابة للنقاط الطرفية (EDR) على أجهزة Linux
- مراقبة محاولات تصعيد الامتيازات المريبة
- تنفيذ قائمة بيضاء للتطبيقات لمنع تنفيذ الملفات الثنائية غير المصرح بها
- استخدام Azure Policy لفرض خطوط الأساس الأمنية

4. قواعد الكشف:
- مراقبة محاولات تصعيد الامتيازات غير المتوقعة في سجلات النظام
- التنبيه على أنماط الوصول إلى ذاكرة الكومة غير العادية
- تتبع أوامر sudo/su الفاشلة والناجحة
- مراقبة مؤشرات الاستغلال: أخطاء التجزئة والتفريغات الأساسية والسلوك غير الطبيعي للعملية
- تنفيذ قواعد auditd لتسجيل جميع محاولات تصعيد الامتيازات
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 - Access Control Policies ECC 2024 A.5.2.1 - User Registration and De-registration ECC 2024 A.5.3.1 - Access Rights Review ECC 2024 A.8.2.1 - System Hardening ECC 2024 A.8.2.3 - Segregation of Duties
🔵 SAMA CSF
SAMA CSF ID.AM-2 - Software Inventory SAMA CSF PR.AC-1 - Access Control Policy SAMA CSF PR.AC-4 - Access Rights Management SAMA CSF DE.CM-1 - System Monitoring SAMA CSF RS.MI-2 - Incident Response Procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 - Access Control ISO 27001:2022 A.5.16 - Identification and Authentication ISO 27001:2022 A.5.18 - Management of Privileged Access Rights ISO 27001:2022 A.8.1 - User Endpoint Devices ISO 27001:2022 A.8.22 - Monitoring
📊 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-122
Exploit No
Patch ✓ Yes
Published 2026-03-10
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.8
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-122
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