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PatchSiren cyber security CVE debrief

CVE-2023-52796 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's ipvlan networking subsystem. The fix introduces a new helper function `ipvlan_route_v6_outbound()` to properly handle IPv6 outbound routing in ipvlan configurations. The vulnerability was resolved through kernel patch implementation. Siemens has identified this CVE as applicable to certain industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches. The CISA advisory (ICSA-25-226-15) was initially published on August 12, 2025, with subsequent revisions through February 25, 2026, to correct affected product listings and remove rejected CVEs. No CVSS score or severity rating is currently available in the source data. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

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 equipment including SCALANCE X-family managed switches and RUGGEDCOM RST2428P devices in critical infrastructure, manufacturing, and utility environments. Security teams responsible for OT/ICS network infrastructure should prioritize firmware updates and network monitoring for affected devices.

Technical summary

The vulnerability exists in the Linux kernel's ipvlan (IP virtual LAN) driver, which provides lightweight L3 networking virtualization. The resolution adds a dedicated `ipvlan_route_v6_outbound()` helper function to properly manage IPv6 outbound packet routing within ipvlan interfaces. Without this fix, improper IPv6 route handling in ipvlan configurations could lead to network connectivity issues or potentially exploitable conditions. The fix ensures correct routing decisions for IPv6 traffic egressing from ipvlan slave interfaces.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-613116 for detailed affected product versions and patch availability
  • Verify SINEC OS version on affected SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family and RUGGEDCOM RST2428P devices
  • Apply vendor-provided firmware updates when available per Siemens security advisory
  • Monitor network traffic for anomalous ipvlan-related behavior on affected industrial switches
  • Implement network segmentation for critical industrial control systems as defense-in-depth measure

Evidence notes

Source indicates this CVE was resolved via kernel patch adding ipvlan_route_v6_outbound() helper. Siemens ProductCERT advisory SSA-613116 is the authoritative source for affected product status. CISA advisory ICSA-25-226-15 underwent four revision cycles, with the most recent update on 2026-02-25 reflecting republication based on Siemens advisory. Threat assessment in source marks impact as 'Misinformed' for affected product IDs.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-52796 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-52796

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

  • CVE-2023-52796 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-52796

    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.