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PatchSiren cyber security CVE debrief

CVE-2024-39468 Siemens CVE debrief

A deadlock vulnerability exists in the Linux kernel SMB client implementation within the smb2_find_smb_tcon() function. This flaw can cause the SMB client to become unresponsive when processing certain SMB2 protocol operations, leading to a denial-of-service condition. The vulnerability stems from improper locking mechanisms that can result in a circular wait condition between kernel threads.

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 with SMB/CIFS connectivity requirements, particularly those deploying RUGGEDCOM RST2428P switches or SCALANCE XC/XR series devices in critical infrastructure environments. Security teams responsible for OT/ICS network segmentation and availability should assess exposure. System integrators and asset owners utilizing SINEC OS-based management platforms should monitor vendor advisories for remediation timelines.

Technical summary

CVE-2024-39468 is a medium-severity vulnerability (CVSS 5.5) in the Linux kernel SMB client subsystem. The flaw manifests as a deadlock in the smb2_find_smb_tcon() function, which can render SMB client operations unresponsive. This vulnerability affects Siemens industrial networking products that incorporate the vulnerable Linux kernel SMB client implementation, including RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. The vulnerability was disclosed on 2025-08-12 and was subsequently incorporated into CISA's ICS advisory program. A significant advisory update occurred on 2026-02-25, reflecting republication based on Siemens ProductCERT guidance. Organizations should prioritize patch deployment and implement compensating controls per CISA ICS recommended practices.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided firmware updates for affected Siemens industrial networking products when available
  • Monitor for SMB client hang conditions in systems utilizing SMB/CIFS connectivity
  • Implement network segmentation to limit SMB traffic exposure for critical industrial control systems
  • Review and apply CISA ICS recommended practices for defense-in-depth strategies
  • Consider disabling SMB client functionality on affected devices if not operationally required

Evidence notes

The vulnerability description indicates a deadlock condition in the SMB client subsystem of the Linux kernel. The smb2_find_smb_tcon() function is responsible for locating SMB tree connection structures during SMB2 protocol operations. Deadlocks in this context typically arise from improper acquisition or release of synchronization primitives (mutexes, spinlocks) when handling concurrent SMB requests or during error recovery paths.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-39468 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-39468

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

  • CVE-2024-39468 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-39468

    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.