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CVE-2024-26752 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's L2TP (Layer 2 Tunneling Protocol) subsystem where an incorrect message length was passed to the `ip6_append_data` function. The vulnerability was resolved by correcting the message length parameter passed during IPv6 packet construction in L2TP. The issue affects Siemens industrial networking products that incorporate the vulnerable Linux kernel code, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS. CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. The vulnerability is classified as 'Misinformed' in the source advisory's threat categorization. No CVSS score or severity rating is available in the provided source data.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
Unknown
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 including SCALANCE X-family switches and RUGGEDCOM devices, particularly those utilizing L2TP over IPv6 in operational technology environments.

Technical summary

The vulnerability exists in the Linux kernel's L2TP implementation where the `ip6_append_data` function receives an incorrect message length parameter during IPv6 packet construction. This can lead to improper packet handling. The fix ensures the correct message length is passed to maintain proper IPv6 datagram assembly in L2TP tunnels.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-613116 for detailed product impact and patch availability
  • Verify SINEC OS version on affected Siemens SCALANCE and RUGGEDCOM devices
  • Apply vendor-provided firmware updates when available per Siemens security advisory
  • Monitor CISA ICS advisories for additional guidance on industrial control system protections
  • Implement network segmentation for industrial control systems per CISA recommended practices

Evidence notes

Vulnerability resolved in Linux kernel L2TP subsystem. Affects Siemens SINEC OS-based products including RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family. Advisory ICSA-25-226-15 published by CISA with multiple revisions through 2026-02-25.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26752 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26752

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

  • CVE-2024-26752 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26752

    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.