PatchSiren

PatchSiren cyber security CVE debrief

CVE-2024-40902 Siemens CVE debrief

A buffer overflow vulnerability exists in the Journaled File System (JFS) extended attribute (xattr) handling code. When an xattr size exceeds the expected value, the kernel logs the xattr content in hexadecimal format for debugging purposes. This logging operation can read beyond the allocated buffer boundary, resulting in an out-of-bounds access. The vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input). The issue was initially published on 2025-08-12 and subsequently modified on 2026-02-25. Siemens ProductCERT issued advisory SSA-355557 addressing this vulnerability in third-party components used within SINEC OS, with CISA republishing this guidance as ICSA-25-226-07. The affected products include Siemens industrial networking equipment running SINEC OS that incorporates the vulnerable JFS implementation. No known exploitation in ransomware campaigns has been documented.

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 with SINEC OS, particularly those in critical infrastructure sectors. System administrators maintaining Linux-based industrial control systems utilizing JFS filesystems. Security teams responsible for OT/ICS asset protection and vulnerability management programs.

Technical summary

The vulnerability resides in the JFS filesystem's extended attribute (xattr) debugging functionality. When processing xattr data with a size larger than expected, the kernel's hex dump logging routine accesses memory beyond the buffer boundary. This occurs in the xattr handling code path where debug logging is performed without proper bounds validation. The issue affects systems utilizing JFS with extended attributes enabled. In the Siemens product context, this vulnerability affects SINEC OS deployments on specific industrial networking hardware families including RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. The vulnerability requires local access or filesystem-level interaction to trigger the malformed xattr condition.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-355557 for affected product configurations and patch availability
  • Apply vendor-provided firmware updates for SINEC OS-based devices when available
  • Monitor kernel logs for unexpected xattr-related messages as potential indicators of exploitation attempts
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Validate extended attribute handling in custom JFS deployments through code review

Evidence notes

The vulnerability description is derived from the official CVE record and CISA CSAF advisory ICSA-25-226-07. The CWE-120 classification is referenced in the source material. Siemens ProductCERT advisory SSA-355557 provides vendor-specific context for affected industrial control system products. The timeline reflects the CVE publication date of 2025-08-12 and modification date of 2026-02-25 as specified in official records.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-40902 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-40902

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

  • CVE-2024-40902 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-40902

    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.