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PatchSiren cyber security CVE debrief

CVE-2024-47679 Siemens CVE debrief

A race condition vulnerability exists in the Linux kernel's Virtual File System (VFS) layer, specifically between `evict_inodes()` and `find_inode()`/`iput()` operations. This flaw affects Siemens industrial networking products running SINEC OS, which incorporates the vulnerable Linux kernel component. The vulnerability was published on August 12, 2025, with subsequent advisory updates through February 25, 2026, to refine affected product listings and incorporate corrections from Siemens ProductCERT.

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 RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500, or SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices in industrial control system environments. System administrators responsible for maintaining availability of critical infrastructure networking equipment. Security teams monitoring for kernel-level vulnerabilities in embedded industrial systems.

Technical summary

This vulnerability stems from a race condition in the Linux kernel's Virtual File System (VFS) between the `evict_inodes()` function and concurrent `find_inode()`/`iput()` operations. The flaw can lead to system instability or denial of service conditions. The vulnerability is locally exploitable with low attack complexity, requiring only low privileges but no user interaction. The primary impact is to system availability. Siemens has addressed this in SINEC OS-based products through firmware updates to version 3.2 or later. The advisory scope was refined through multiple revisions to accurately reflect affected product configurations.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided firmware updates to V3.2 or later for RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices
  • For SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, consult Siemens ProductCERT advisory SSA-355557 for specific configuration guidance
  • Implement network segmentation to limit local access to affected industrial control systems
  • Monitor for anomalous system behavior or unexpected reboots that may indicate exploitation attempts
  • Follow CISA ICS recommended practices for defense-in-depth strategies
  • Review and apply Siemens security advisories as they are published for affected product lines

Evidence notes

The vulnerability description indicates a race condition in VFS inode handling. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) confirms local attack vector with low attack complexity, requiring low privileges but no user interaction, resulting in high availability impact. The source advisory underwent three revisions: initial publication (2025-08-12), correction of affected products (2026-02-12), clarification of SCALANCE family configurations and removal of rejected CVEs (2026-02-24), and final CISA republication based on Siemens SSA-355557 (2026-02-25).

Sources and references

Verified primary and authoritative sources

  • CVE-2024-47679 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-47679

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

  • CVE-2024-47679 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-47679

    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.