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PatchSiren cyber security CVE debrief

CVE-2024-26804 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's IP tunnel implementation where perpetual headroom growth could occur. The issue was resolved by preventing unbounded headroom expansion in net/ip_tunnel. 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 family devices. CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product lists and removal of rejected CVEs. The threat assessment categorizes the impact as 'Misinformed' per the source advisory. No CVSS score or severity rating is available in the provided source corpus.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2024-04-04
Original CVE updated
2026-08-12
Advisory published
2024-04-04
Advisory updated
2026-08-12

Who should care

Organizations operating Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family switches, RUGGEDCOM RST2428P devices, or other affected industrial networking equipment utilizing IP tunnel features. OT security teams and network administrators responsible for critical infrastructure networks should prioritize firmware updates.

Technical summary

The vulnerability exists in the Linux kernel's IP tunnel (net/ip_tunnel) implementation where perpetual headroom growth could occur, potentially leading to resource exhaustion or packet processing issues. The fix prevents unbounded headroom expansion. This affects Siemens industrial networking products that utilize IP tunneling functionality within their SINEC OS operating system.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-613116 for detailed product-specific patch information
  • Verify SINEC OS version on affected SCALANCE and RUGGEDCOM devices
  • Apply vendor-provided firmware updates to address the underlying Linux kernel vulnerability
  • Monitor network traffic for anomalous IP tunnel behavior as a detection control
  • Follow CISA ICS recommended practices for defense-in-depth strategies

Evidence notes

Source indicates this vulnerability was resolved in the Linux kernel. The CISA CSAF advisory ICSA-25-226-15 underwent multiple revisions: initial publication (2025-08-12), corrected affected products (2026-02-12), removed rejected CVEs and unsupported version notes (2026-02-24), and final republication based on Siemens ProductCERT SSA-613116 (2026-02-25). Threat category 'Misinformed' assigned to affected product IDs CSAFPID-0001, CSAFPID-0003, CSAFPID-0004.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26804 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26804

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

  • CVE-2024-26804 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26804

    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.