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CVE-2024-41040 Siemens CVE debrief

CVE-2024-41040 is a use-after-free (UAF) vulnerability in the Linux kernel's network scheduler (net/sched) subsystem, specifically triggered when resolving a clash condition. The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. Siemens has identified this CVE as affecting certain industrial networking products, including the RUGGEDCOM RST2428P and SCALANCE product families, though the CISA advisory marks the impact assessment as 'Misinformed' for the tracked product IDs. The vulnerability originates from the Linux kernel's traffic control implementation, where improper handling of memory during clash resolution can lead to memory corruption. Organizations should consult the official Siemens ProductCERT advisory for definitive affected product status and patch availability.

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

Organizations operating Siemens RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, or SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices in industrial control system (ICS) environments. Network administrators responsible for traffic control configurations on Linux-based industrial systems should prioritize verification of patch status.

Technical summary

This vulnerability exists in the Linux kernel's network scheduler (net/sched) component, which handles traffic control and quality-of-service (QoS) functions. The UAF condition occurs during clash resolution, a mechanism used when multiple traffic classification rules match the same packet. When resolving these conflicts, improper memory management can result in accessing freed memory, potentially leading to kernel memory corruption, denial of service, or privilege escalation. The vulnerability affects Siemens industrial networking equipment that incorporates vulnerable Linux kernel versions.

Defensive priority

HIGH

Recommended defensive actions

  • Verify affected product status directly with Siemens ProductCERT advisory SSA-355557
  • Apply kernel updates from Siemens when available per vendor guidance
  • Monitor network scheduler configurations on affected industrial systems
  • Implement network segmentation for critical ICS infrastructure
  • Review CISA ICS recommended practices for defense-in-depth strategies

Evidence notes

The source advisory (ICSA-25-226-07) explicitly marks the impact for tracked product IDs as 'Misinformed', indicating potential uncertainty or correction in the initial assessment. The advisory underwent three revision updates between February 2026, including corrections to affected product lists and removal of rejected CVEs. The vulnerability description 'net/sched: UAF when resolving a clash' indicates a memory safety issue in Linux kernel traffic control.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-41040 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-41040

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

  • CVE-2024-41040 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-41040

    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.