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PatchSiren cyber security CVE debrief

CVE-2024-46781 Siemens CVE debrief

A use-after-free vulnerability in the nilfs2 filesystem affects Siemens industrial networking products running SINEC OS. The flaw occurs during mount-time recovery when inodes with recovered data are not properly freed if an error occurs before the log writer starts, potentially leading to memory corruption issues. CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. The vulnerability originates in the Linux kernel's nilfs2 filesystem implementation rather than Siemens proprietary code.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
HIGH 7.8
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

Operators of Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family, and RUGGEDCOM RST2428P industrial networking equipment; industrial control system security teams; critical infrastructure operators using affected Siemens devices

Technical summary

The nilfs2 filesystem contains a use-after-free vulnerability triggered during mount-time recovery. When the filesystem attempts to recover data from the log, inodes containing recovered data are allocated but not properly freed if an error condition occurs before the log writer thread starts. This failure to release allocated inodes can result in memory corruption. The vulnerability affects Siemens industrial networking products that incorporate the vulnerable nilfs2 implementation through their SINEC OS operating system.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-355557 for detailed product-specific guidance
  • Apply vendor-provided firmware updates for affected SCALANCE and RUGGEDCOM devices when available
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Monitor for anomalous system behavior during filesystem mount operations on affected devices

Evidence notes

Source: CISA CSAF advisory ICSA-25-226-07, republished February 25, 2026 based on Siemens ProductCERT SSA-355557. The advisory's threat assessment categorizes impact as 'Misinformed' for affected product IDs CSAFPID-0006, CSAFPID-0002, and CSAFPID-0003.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-46781 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-46781

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

  • CVE-2024-46781 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-46781

    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.