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PatchSiren cyber security CVE debrief

CVE-2024-47756 Siemens CVE debrief

A logic error in the Keystone PCI controller driver (ks_pcie_quirk()) uses a logical AND (&&) where OR (||) was intended, potentially causing NULL pointer dereference and local denial-of-service. The vulnerability affects Siemens industrial networking products running SINEC OS with vulnerable Linux kernel versions. CISA published this advisory on 2025-08-12; Siemens subsequently updated affected product lists through February 2026.

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 in critical infrastructure sectors (energy, manufacturing, transportation). Security teams managing OT/ICS environments with RUGGEDCOM or SCALANCE devices. System administrators responsible for SINEC OS deployments and kernel patch management.

Technical summary

The ks_pcie_quirk() function in the Linux kernel's Keystone PCI controller driver contains a logic error where && (logical AND) was used instead of || (logical OR) in a conditional expression. This flaw can lead to NULL pointer dereference when the driver evaluates the malformed condition, resulting in local denial-of-service. The vulnerability requires local access with low privileges and has no confidentiality or integrity impact. Siemens industrial networking products incorporating vulnerable kernel versions are affected, including RUGGEDCOM RST2428P and multiple SCALANCE families. Remediation involves firmware updates to version 3.2 or later, with specific configuration-based guidance for certain SCALANCE product lines.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-supplied firmware updates: Update RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices to version 3.2 or later per Siemens guidance
  • For SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, consult Siemens ProductCERT advisory SSA-355557 for specific configuration-based remediation
  • Validate kernel versions on affected Siemens devices running SINEC OS to ensure patched Keystone PCI driver
  • Implement network segmentation for industrial control systems per CISA ICS recommended practices
  • Monitor for anomalous system crashes or PCI-related errors that may indicate exploitation attempts

Evidence notes

CISA ICS advisory ICSA-25-226-07 published 2025-08-12 documents this CVE as affecting Siemens RUGGEDCOM RST2428P and SCALANCE product families. Siemens ProductCERT advisory SSA-355557 provides vendor remediation guidance. The vulnerability originates from a Linux kernel PCI subsystem patch fixing an operator precedence error in ks_pcie_quirk().

Sources and references

Verified primary and authoritative sources

  • CVE-2024-47756 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-47756

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

  • CVE-2024-47756 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-47756

    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.