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CVE-2024-46759 Siemens CVE debrief

CVE-2024-46759 is a medium-severity (CVSS 5.5) integer underflow vulnerability in the Linux kernel's hwmon adc128d818 driver. The flaw occurs when user-provided limit attributes are processed: DIV_ROUND_CLOSEST() is called after kstrtol() without proper bounds checking, causing an underflow when large negative numbers (e.g., -9223372036854775808) are supplied. The fix reorders clamp_val() and DIV_ROUND_CLOSEST() operations to prevent the underflow. Siemens has identified affected products in its industrial networking portfolio, including RUGGEDCOM RST2428P and SCALANCE switch families running SINEC OS. The vulnerability was published on August 12, 2025, with the advisory last modified on February 25, 2026.

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

Organizations operating Siemens industrial networking equipment including RUGGEDCOM RST2428P switches and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 and XCM-/XRM-/XCH-/XRH-300 families running SINEC OS. OT security teams managing Linux-based industrial control systems with hardware monitoring capabilities should prioritize patching.

Technical summary

The adc128d818 hardware monitoring driver in the Linux kernel contains an integer underflow vulnerability in its limit attribute handling. When a user writes a large negative value to a limit attribute, the kstrtol() function converts it to a signed long, which DIV_ROUND_CLOSEST() then operates on before clamp_val() can enforce bounds. This ordering allows the underflow to occur. The resolution reorders these operations so that clamp_val() executes before DIV_ROUND_CLOSEST(), ensuring the value is bounded before arithmetic operations. This is a local vulnerability requiring authenticated access with low privileges, with impact limited to availability (system crash or instability).

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided firmware updates to affected Siemens industrial networking products: update RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family to V3.2 or later; for SCALANCE XC-300/XR-300/XC-400/XR-500WG
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Evidence notes

The vulnerability description and affected products are derived from CISA CSAF advisory ICSA-25-226-07, which references Siemens ProductCERT advisory SSA-355557. The CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H indicates local attack vector with low attack complexity, requiring low privileges and resulting in high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-46759 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-46759

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

  • CVE-2024-46759 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-46759

    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.