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PatchSiren cyber security CVE debrief

CVE-2024-42102 Siemens CVE debrief

A vulnerability in the Linux kernel's memory management dirty throttling logic, where a reverted commit introduced multiplication overflow on 32-bit architectures when dirty thresholds exceed 32-bit limits. The issue affects Siemens industrial networking products running vulnerable kernel versions.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
NONE
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

Industrial control system operators using Siemens SCALANCE or RUGGEDCOM networking equipment; organizations running 32-bit Linux kernels in operational technology environments; security teams responsible for OT/ICS patch management.

Technical summary

The vulnerability stems from commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78 in the Linux kernel's mm/writeback subsystem. The reverted change removed a (u64) cast from a multiplication operation in wb_dirty_limits(), causing integer overflow on 32-bit architectures when wb_thresh * bg_thresh exceeds 2^32 pages—a condition commonly triggered with 4GB RAM default settings. The commit also introduced unnecessarily expensive div64_u64() operations. The revert was part of a patch series ensuring dirty limits fit within 32-bit page units. Siemens has confirmed affected products in their SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family, and RUGGEDCOM RST2428P product lines.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided firmware updates to V3.1 or later for affected Siemens SCALANCE and RUGGEDCOM products
  • Review CISA ICS recommended practices for defense-in-depth strategies
  • Monitor Siemens ProductCERT advisories for additional affected product notifications
  • Validate dirty throttling configurations on 32-bit Linux systems in industrial environments

Evidence notes

CVE published 2025-08-12. CISA advisory ICSA-25-226-15 published same date, with subsequent updates through 2026-02-25. Siemens ProductCERT advisory SSA-613116 provides vendor remediation guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-42102 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-42102

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-42102 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-42102

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-226-15.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-613116.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-613116.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-15

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.