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CVE-2024-46731 Siemens CVE debrief

CVE-2024-46731 describes an out-of-bounds read vulnerability in the Linux kernel's drm/amd/pm (AMD Power Management) subsystem. The flaw occurs when an index calculation (i - 1U) can underflow when i equals zero, causing an access beyond the bounds of the mc_data[] array. This vulnerability was originally published in the Linux kernel context but appears in Siemens industrial control system advisories due to third-party component usage. The CISA ICS advisory ICSA-25-226-07, published 2025-08-12 and most recently modified 2026-02-25, tracks this CVE as part of Siemens' SINEC OS third-party component security assessment. Notably, the advisory's threat assessment categorizes impact as 'Misinformed' for affected product IDs, and revision history indicates significant updates including CVE removals and product scope clarifications through February 2026. No CVSS score or severity rating is available in the source corpus. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

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 network infrastructure including SINEC OS, SCALANCE XC/XR/XCM/XRM/XCH/XRH series switches, and RUGGEDCOM RST2428P devices; OT security teams managing Linux-based embedded systems with AMD graphics components; infrastructure operators relying on CISA ICS advisories for third-party component risk tracking

Technical summary

An integer underflow vulnerability exists in the AMD Power Management (drm/amd/pm) subsystem of the Linux kernel. When processing memory controller data, the code calculates an array index as i - 1U without validating that i is non-zero. When i equals 0, this calculation underflows to a large unsigned value, resulting in an out-of-bounds read from the mc_data[] array. This vulnerability affects systems with AMD GPUs running vulnerable Linux kernel versions. In the industrial control system context tracked by CISA and Siemens, this represents third-party component exposure in SINEC OS and related network infrastructure products. The vulnerability is classified with 'Misinformed' impact in the Siemens/CISA assessment, suggesting limited or context-dependent exploitability in the specific product configurations evaluated.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-355557 for affected product configurations and patch availability
  • Verify SINEC OS and related Siemens network component firmware versions against vendor security guidance
  • Apply defense-in-depth controls per CISA ICS recommended practices for industrial control systems
  • Monitor CISA ICS advisories for updates to ICSA-25-226-07 as product scope has changed in recent revisions
  • Assess exposure of AMD GPU-dependent systems in OT environments where Linux-based components are deployed

Evidence notes

Source corpus indicates this CVE originated in Linux kernel drm/amd/pm subsystem (out-of-bounds read via underflow at i=0). CISA ICS advisory ICSA-25-226-07 tracks this as third-party component in Siemens SINEC OS. Threat assessment marked 'Misinformed' for product IDs CSAFPID-0006, CSAFPID-0002, CSAFPID-0003. Advisory underwent four revisions: initial publication (2025-08-12), product list correction (2026-02-12), configuration clarification and CVE removal (2026-02-24), and republication based on Siemens SSA-355557 (2026-02-25). No CVSS vector or score present in source. Not in KEV.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-46731 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-46731

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

  • CVE-2024-46731 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-46731

    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.