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PatchSiren cyber security CVE debrief

CVE-2024-35984 Siemens CVE debrief

A NULL function pointer dereference vulnerability exists in the I2C SMBus subsystem of the Linux kernel. This flaw can lead to a local denial-of-service condition when an attacker with low privileges triggers the dereference, resulting in system instability or crash. The vulnerability is classified as MEDIUM severity with a CVSS 3.1 score of 5.5, indicating localized impact without confidentiality or integrity compromise. Siemens has identified this vulnerability as affecting certain industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches. The vulnerability was initially published on August 12, 2025, with subsequent advisory revisions through February 2026 to correct affected product listings and remove rejected CVE entries. CISA republished the advisory on February 25, 2026, based on updated Siemens ProductCERT guidance.

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 SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family switches, SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices, or RUGGEDCOM RST2428P industrial Ethernet switches in critical infrastructure, manufacturing, or process control environments. System administrators responsible for industrial control system security and network engineers managing OT/IT convergence infrastructure should prioritize firmware updates.

Technical summary

The vulnerability resides in the Linux kernel's I2C SMBus implementation where a NULL function pointer dereference can occur. This is a classic software defect where a function pointer is invoked without validation, leading to undefined behavior and potential kernel panic. The attack requires local access with low privileges and no user interaction, making it exploitable by authenticated users or processes on the affected system. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) confirms the localized availability impact with high severity on the affected component. Siemens industrial networking products incorporating the vulnerable kernel code are exposed to this issue, potentially impacting operational technology environments where these devices are deployed.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided firmware updates to version 3.1 or later for affected SCALANCE and RUGGEDCOM devices
  • Verify current firmware version through Siemens Industry Online Support portal
  • Implement network segmentation for industrial control systems to limit local attack vector exposure
  • Monitor for anomalous system crashes or instability on affected devices
  • Review CISA ICS recommended practices for defense-in-depth strategies
  • Establish maintenance windows for firmware updates on critical infrastructure devices

Evidence notes

Vulnerability description and CVSS vector derived from CISA CSAF advisory ICSA-25-226-15. Product impact confirmed through Siemens ProductCERT SSA-613116. Advisory revision history documents corrections to affected product list and removal of rejected CVEs in February 2026 updates.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-35984 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-35984

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

  • CVE-2024-35984 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-35984

    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.