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CVE-2024-43098 Siemens CVE debrief

CVE-2024-43098 is a medium-severity (CVSS 5.5) deadlock vulnerability in the Linux kernel's I3C (Improved Inter-Integrated Circuit) subsystem. The issue stems from a double-lock acquisition pattern in `i3c_master_register()`, which acquires `i3cbus->lock` twice, potentially causing a deadlock condition. The vulnerability affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 and XCM-/XRM-/XCH-/XRH-300 families. The flaw was published on August 12, 2025, with subsequent advisory updates through February 25, 2026, including corrections to affected product lists and removal of rejected CVEs. Siemens has provided vendor fixes, with updates to version 3.2 or later recommended for affected products.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
MEDIUM 5.5
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 deploying RUGGEDCOM RST2428P switches or SCALANCE XC/XR/XCM/XRM/XCH/XRH series managed switches in critical infrastructure, manufacturing, or process control environments. Security teams responsible for OT/ICS asset management and patch coordination should prioritize this update.

Technical summary

The vulnerability exists in the Linux kernel's I3C subsystem where `i3c_master_register()` acquires `i3cbus->lock` twice, creating a potential deadlock condition. The fix involves using `i3cdev->desc->info` directly instead of calling `i3c_device_get_info()` to avoid the recursive lock acquisition. This is a local attack vector requiring low privileges with no user interaction, resulting in high availability impact.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided updates to version 3.2 or later for affected Siemens RUGGEDCOM RST2428P and SCALANCE product families
  • Review Siemens ProductCERT advisory SSA-355557 for specific configuration guidance on SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family deployments
  • Follow CISA ICS recommended practices for defense-in-depth strategies for industrial control systems
  • Monitor for additional vendor communications regarding patch availability and deployment guidance
  • Assess network segmentation to limit exposure of affected industrial networking equipment

Evidence notes

CVE published 2025-08-12; CISA ICS advisory ICSA-25-226-07; Siemens ProductCERT SSA-355557; advisory modified 2026-02-25 with product list corrections and CVE removals.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-43098 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-43098

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

  • CVE-2024-43098 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-43098

    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-25-226-07.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-355557.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-355557.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-07

    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.