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PatchSiren cyber security CVE debrief

CVE-2023-6606 Siemens CVE debrief

An out-of-bounds read vulnerability in the Linux Kernel's SMB client implementation (smbCalcSize in fs/smb/client/netmisc.c) affects Siemens industrial networking products. The vulnerability allows a local attacker to crash the system or leak internal kernel information. Siemens has assessed this vulnerability as **Misinformed** for affected product lines, indicating the reported impact does not apply to their specific implementations. The advisory was initially published on August 12, 2025, with subsequent revisions through February 25, 2026, including corrections to affected product lists and removal of rejected CVEs.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
HIGH 7.1
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 RUGGEDCOM and SCALANCE product families, should review this advisory to confirm their exposure assessment. Security teams managing Linux-based industrial systems with SMB client functionality should verify kernel versions and local access controls. ICS/OT security practitioners should incorporate this into defense-in-depth strategies for industrial networks.

Technical summary

The vulnerability exists in smbCalcSize() within fs/smb/client/netmisc.c in the Linux Kernel. An out-of-bounds read condition can occur, potentially allowing a local attacker to cause system crashes or leak kernel memory contents. Siemens has determined this vulnerability is **Misinformed** for their affected product lines (RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family), suggesting the reported vulnerability does not represent an actual security risk in their specific implementations. The advisory underwent multiple revisions between August 2025 and February 2026 to correct product impact assessments.

Defensive priority

medium

Recommended defensive actions

  • Verify Siemens SINEC OS and SCALANCE/RUGGEDCOM firmware versions against Siemens ProductCERT SSA-613116 guidance
  • Review local access controls on affected industrial networking devices to mitigate local attack vector
  • Monitor Siemens security advisories for any reassessment of vulnerability impact
  • Apply defense-in-depth practices for industrial control systems per CISA recommendations

Evidence notes

Siemens ProductCERT SSA-613116 advisory (via CISA CSAF ICSA-25-226-15) identifies CVE-2023-6606 as 'Misinformed' for RUGGEDCOM RST2428P and SCALANCE X-family products. The Linux Kernel vulnerability itself was originally identified in 2023, but Siemens' assessment and CISA republication occurred in 2025-2026.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-6606 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-6606

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

  • CVE-2023-6606 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-6606

    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.