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CVE-2024-27419 Siemens CVE debrief

A data race vulnerability exists in the Linux kernel's NET/ROM amateur packet radio protocol implementation. The `sysctl_net_busy_read` value can be read while being concurrently modified, potentially leading to inconsistent state. This affects Siemens SIMATIC S7-1500 TM MFP industrial control systems that utilize the GNU/Linux subsystem. The vulnerability is local in nature, requiring low privileges and no user interaction, with a primary impact of availability disruption.

Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2024-04-09
Original CVE updated
2026-05-14
Advisory published
2024-04-09
Advisory updated
2026-05-14

Who should care

Organizations operating Siemens SIMATIC S7-1500 TM MFP systems with enabled GNU/Linux subsystems, particularly in critical infrastructure and industrial automation environments. Security teams responsible for OT/ICS asset protection and kernel-level vulnerability management should prioritize access controls pending vendor fixes.

Technical summary

The vulnerability resides in the Linux kernel's NET/ROM protocol implementation, specifically in the handling of the `sysctl_net_busy_read` sysctl parameter. A data race occurs when the sysctl value is read while being concurrently modified, as the reader lacks proper synchronization protection. This is a local vulnerability requiring low privileges, with no confidentiality or integrity impact but potential high availability impact. The affected product is the GNU/Linux subsystem within Siemens SIMATIC S7-1500 TM MFP industrial controllers. No patch is currently available; mitigation relies on access restrictions and trusted application execution.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
  • Build and run only applications from trusted sources
  • Monitor for kernel updates from Siemens when fixes become available
  • Apply defense-in-depth strategies for industrial control system environments
  • Review CISA ICS recommended practices for additional hardening guidance

Evidence notes

The vulnerability description indicates a classic data race condition in kernel sysctl handling. The NET/ROM protocol (network layer for amateur packet radio) contains insufficient synchronization around the `sysctl_net_busy_read` parameter. Siemens has confirmed this affects the GNU/Linux subsystem of their SIMATIC S7-1500 TM MFP product line. CISA has tracked this through ICSA-24-102-01 with multiple revision updates through 2025-09-09, indicating ongoing monitoring of related kernel vulnerabilities.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27419 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27419

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

  • CVE-2024-27419 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27419

    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/2024/icsa-24-102-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-265688.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-265688.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-102-01

    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.