---
title: "Siemens SIMATIC CN 4100 Hit by 150+ Critical Linux Kernel Vulnerabilities"
short_title: "Siemens SIMATIC faces 150+ kernel flaws"
description: "Siemens warns of 150+ critical Linux kernel vulnerabilities in SIMATIC CN 4100, risking availability, integrity, and confidentiality. Update to V5.0+ immediately."
author: "Tom"
date: 2026-05-14
categories: [Cybersecurity, Vulnerabilities]
tags: [siemens, linux-kernel, cve, industrial-security, patch-management]
score: 0.95
cve_ids: [CVE-2024-47704, CVE-2024-57924, CVE-2024-58240, CVE-2025-6021, CVE-2025-6052, CVE-2025-7425, CVE-2025-8916, CVE-2025-9230, CVE-2025-9231, CVE-2025-9232, CVE-2025-9820, CVE-2025-14831, CVE-2025-23143, CVE-2025-23160, CVE-2025-31257, CVE-2025-37931, CVE-2025-37968, CVE-2025-38322, CVE-2025-38347, CVE-2025-38491, CVE-2025-38502, CVE-2025-38552, CVE-2025-38614, CVE-2025-38670, CVE-2025-38676, CVE-2025-38677, CVE-2025-38679, CVE-2025-38680, CVE-2025-38681, CVE-2025-38683, CVE-2025-38684, CVE-2025-38685, CVE-2025-38687, CVE-2025-38691, CVE-2025-38693, CVE-2025-38694, CVE-2025-38695, CVE-2025-38696, CVE-2025-38697, CVE-2025-38698, CVE-2025-38699, CVE-2025-38700, CVE-2025-38701, CVE-2025-38702, CVE-2025-38706, CVE-2025-38707, CVE-2025-38708, CVE-2025-38711, CVE-2025-38712, CVE-2025-38713, CVE-2025-38714, CVE-2025-38715, CVE-2025-38721, CVE-2025-38723, CVE-2025-38724, CVE-2025-38725, CVE-2025-38727, CVE-2025-38728, CVE-2025-38729, CVE-2025-38732, CVE-2025-38735, CVE-2025-38736, CVE-2025-39673, CVE-2025-39675, CVE-2025-39676, CVE-2025-39681, CVE-2025-39682, CVE-2025-39683, CVE-2025-39684, CVE-2025-39685, CVE-2025-39686, CVE-2025-39687, CVE-2025-39689, CVE-2025-39691, CVE-2025-39692, CVE-2025-39693, CVE-2025-39694, CVE-2025-39697, CVE-2025-39701, CVE-2025-39702, CVE-2025-39703, CVE-2025-39706, CVE-2025-39709, CVE-2025-39710, CVE-2025-39713, CVE-2025-39714, CVE-2025-39715, CVE-2025-39716, CVE-2025-39718, CVE-2025-39719, CVE-2025-39724, CVE-2025-39736, CVE-2025-39737, CVE-2025-39738, CVE-2025-39742, CVE-2025-39743, CVE-2025-39749, CVE-2025-39752, CVE-2025-39756, CVE-2025-39757, CVE-2025-39759, CVE-2025-39760, CVE-2025-39766, CVE-2025-39770, CVE-2025-39772, CVE-2025-39773, CVE-2025-39776, CVE-2025-39782, CVE-2025-39783, CVE-2025-39787, CVE-2025-39788, CVE-2025-39790, CVE-2025-39794, CVE-2025-39795, CVE-2025-39798, CVE-2025-39800, CVE-2025-39801, CVE-2025-39806, CVE-2025-39808, CVE-2025-39812, CVE-2025-39813, CVE-2025-39817, CVE-2025-39819, CVE-2025-39823, CVE-2025-39824, CVE-2025-39825, CVE-2025-39826, CVE-2025-39827, CVE-2025-39828, CVE-2025-39835, CVE-2025-39838, CVE-2025-39839, CVE-2025-39841, CVE-2025-39842, CVE-2025-39843, CVE-2025-39844, CVE-2025-39845, CVE-2025-39846, CVE-2025-39847, CVE-2025-39848, CVE-2025-39849, CVE-2025-39853, CVE-2025-39857, CVE-2025-39860, CVE-2025-39864, CVE-2025-39865, CVE-2025-39866, CVE-2025-40300, CVE-2025-43368, CVE-2025-47219, CVE-2025-48989, CVE-2025-53057, CVE-2025-53066, CVE-2025-55752, CVE-2025-55754, CVE-2025-61748, CVE-2025-61795, CVE-2026-2673, CVE-2026-21925, CVE-2026-21932, CVE-2026-21933, CVE-2026-21945, CVE-2026-21947, CVE-2026-22924, CVE-2026-22925, CVE-2026-28387, CVE-2026-28388, CVE-2026-28389, CVE-2026-28390, CVE-2026-31789, CVE-2026-31790]
## TL;DR
Siemens has disclosed over 150 critical Linux kernel vulnerabilities affecting its SIMATIC CN 4100 industrial control system, potentially compromising availability, integrity, and confidentiality. The flaws include use-after-free, buffer overflows, and privilege escalation risks. Siemens urges immediate updates to V5.0 or later to mitigate these severe threats.
Main Content
### Introduction
Siemens has issued a critical security advisory (ICSA-26-134-10) revealing a staggering 150+ vulnerabilities in the Linux kernel affecting its SIMATIC CN 4100 industrial control system. These flaws span memory corruption, privilege escalation, and denial-of-service risks, posing severe threats to industrial environments. Organizations must prioritize patching to V5.0 or later to prevent potential exploitation.
### Key Points
- Massive Vulnerability Exposure: Over 150 CVEs identified, including critical flaws like use-after-free, buffer overflows, and null pointer dereferences.
- Affected Systems: Siemens SIMATIC CN 4100 versions prior to V5.0 are vulnerable; all are marked as "known_affected."
- Impact: Risks include system crashes, unauthorized code execution, and data breaches, with CVSS scores ranging from 4.0 to 9.6.
- Mitigation: Siemens recommends updating to V5.0 or later. No workarounds are provided—patching is mandatory.
- Industrial Security Implications: These vulnerabilities could disrupt critical manufacturing processes, given the system's deployment in critical infrastructure.
### Technical Details
The vulnerabilities stem from flaws in the Linux kernel's handling of various components, including:
- Memory Management: Use-after-free (e.g., CVE-2025-38680), buffer overflows (e.g., CVE-2025-38685), and null pointer dereferences (e.g., CVE-2025-38693).
- Race Conditions: Improper synchronization (e.g., CVE-2025-38681) and locking issues (e.g., CVE-2025-37968).
- Input Validation: Flaws in parsing and processing (e.g., CVE-2025-38728, CVE-2025-39703).
- Privilege Escalation: Vulnerabilities enabling unauthorized access (e.g., CVE-2025-9820, CVE-2026-21932).
Many of these flaws allow local attackers to escalate privileges or execute arbitrary code, while others enable remote denial-of-service attacks or information disclosure.
### Impact Assessment
The vulnerabilities pose severe risks to industrial control systems:
- Operational Disruption: Exploitation could lead to system crashes or unauthorized control of industrial processes.
- Data Integrity: Memory corruption flaws may allow attackers to manipulate or exfiltrate sensitive data.
- Security Bypass: Privilege escalation vulnerabilities could enable attackers to bypass security controls and gain administrative access.
- Widespread Exposure: Given SIMATIC CN 4100's global deployment in critical manufacturing, these flaws could have far-reaching consequences.
### Mitigation Steps
1. Immediate Patching: Update to SIMATIC CN 4100 V5.0 or later via Siemens' official support portal[^1].
2. Network Segmentation: Isolate industrial control systems from business networks to limit attack surfaces.
3. Monitoring: Deploy intrusion detection systems to identify potential exploitation attempts.
4. Access Controls: Restrict physical and remote access to affected systems to authorized personnel only.
5. Incident Response: Prepare a response plan for potential breaches, including system recovery and forensic analysis.
### Affected Systems
- Product: Siemens SIMATIC CN 4100
- Versions: All versions prior to V5.0
- Deployment: Worldwide, primarily in critical manufacturing sectors
## Conclusion
The discovery of over 150 vulnerabilities in Siemens SIMATIC CN 4100 underscores the critical importance of robust patch management in industrial environments. Organizations must act swiftly to update their systems and implement additional security measures to mitigate the risks posed by these flaws. Failure to do so could result in severe operational disruptions, data breaches, and compromised industrial processes.
## References
[^1]: Siemens ProductCERT. "SSA-032379: Multiple Vulnerabilities in SIMATIC CN 4100". Retrieved 2026-05-14.
[^2]: CISA. "ICSA-26-134-10: Siemens SIMATIC CN 4100". Retrieved 2026-05-14.