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PatchSiren cyber security CVE debrief

CVE-2024-42153 Siemens CVE debrief

A potential deadlock condition exists in the I2C PNX driver where `del_timer_sync()` is called within an interrupt service routine (ISR). This pattern can trigger kernel warnings and may lead to system instability or denial of service conditions in affected industrial control systems. The vulnerability stems from improper synchronization primitives usage in kernel-level I2C bus handling code.

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

Operators of Siemens industrial networking infrastructure, OT security teams managing SCALANCE and RUGGEDCOM deployments, and organizations with SINEC OS-based control systems should prioritize monitoring vendor patch releases.

Technical summary

The vulnerability exists in the Linux kernel I2C PNX driver where `del_timer_sync()` is invoked within an interrupt service routine. This function blocks until the timer callback completes, which can deadlock if the callback attempts to acquire locks already held by the ISR context. The defect manifests as kernel warnings and potential system hangs. Affected Siemens products include SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family switches and RUGGEDCOM RST2428P devices running SINEC OS. The CISA advisory republished 2026-02-25 reflects updated product impact assessments from Siemens.

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 SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family and RUGGEDCOM RST2428P when available
  • Monitor system logs for kernel deadlock warnings related to I2C operations
  • Implement network segmentation for affected industrial control devices per CISA ICS recommended practices
  • Establish maintenance windows for controlled patching of critical infrastructure components

Evidence notes

The CISA CSAF advisory ICSA-25-226-07, republished 2026-02-25, identifies this CVE as affecting Siemens industrial networking products running SINEC OS. The advisory's threat assessment categorizes the impact as 'Misinformed' for affected product IDs CSAFPID-0006, CSAFPID-0002, and CSAFPID-0003. The underlying issue is a Linux kernel I2C driver defect where timer synchronization in interrupt context creates deadlock potential. Siemens ProductCERT SSA-355557 provides the authoritative vendor security advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-42153 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-42153

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

  • CVE-2024-42153 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-42153

    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.