PatchSiren

PatchSiren cyber security CVE debrief

CVE-2024-41077 Siemens CVE debrief

CVE-2024-41077 is a HIGH severity vulnerability (CVSS 7.1) affecting the null_blk Linux kernel driver, which is used in Siemens industrial networking products including the RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS. The vulnerability involves a validation error on block size that could lead to security impacts in affected systems. The issue was initially published on August 12, 2025, and has undergone multiple revisions, with the most recent update on February 25, 2026, which included clarification of affected product configurations and removal of several rejected CVEs from the advisory. While the specific technical details of the block size validation error are limited in available sources, the vulnerability's HIGH severity rating indicates significant potential impact. Organizations using affected Siemens industrial networking equipment should monitor for vendor security advisories and apply patches when available. The vulnerability is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, and there is no confirmed evidence of known ransomware campaign use.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2025-08-12
Original CVE updated
2026-02-25
Advisory published
2025-08-12
Advisory updated
2026-02-25

Who should care

Organizations operating Siemens industrial networking infrastructure, particularly those using RUGGEDCOM RST2428P switches or SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family and XCM-/XRM-/XCH-/XRH-300 family devices running SINEC OS. Critical infrastructure operators, manufacturing facilities, and utilities relying on these industrial Ethernet switches for operational technology (OT) networks should prioritize monitoring and remediation. Security teams responsible for industrial control system (ICS) security and vulnerability management programs should track this advisory for patch availability.

Technical summary

CVE-2024-41077 is a vulnerability in the null_blk (null block device) driver, a Linux kernel component used for testing and benchmarking block I/O subsystems. The vulnerability stems from improper validation of block size parameters, which could potentially lead to memory corruption, denial of service, or other security impacts. The null_blk driver is commonly used in virtualized and testing environments but is also present in production systems including Siemens industrial networking equipment running SINEC OS. The vulnerability affects multiple Siemens product families including RUGGEDCOM RST2428P switches and various SCALANCE X-family industrial Ethernet switches. The exact attack vector and exploitation conditions depend on whether and how the null_blk driver is exposed or accessible in the affected product configurations.

Defensive priority

HIGH

Recommended defensive actions

  • Monitor Siemens ProductCERT security advisories for patch availability and updated affected product information
  • Review SINEC OS and SCALANCE device configurations against vendor guidance to determine exposure
  • Apply vendor-recommended patches when available, prioritizing internet-facing or critical infrastructure systems
  • Implement network segmentation for industrial control systems to limit potential attack exposure
  • Follow CISA ICS recommended practices for defense-in-depth strategies
  • Subscribe to CISA ICS advisories for ongoing threat intelligence related to industrial control systems

Evidence notes

The vulnerability description is limited to 'null_blk: validation error on block size' in available sources. The affected product list has been revised multiple times, with the February 2026 updates correcting the list of affected products and clarifying SCALANCE family configurations.

Official resources

This vulnerability was disclosed through coordinated vulnerability disclosure via CISA and Siemens ProductCERT. The advisory has been updated multiple times to refine affected product listings and clarify configuration requirements.