PatchSiren

PatchSiren cyber security CVE debrief

CVE-2024-47663 Siemens CVE debrief

CVE-2024-47663 is a division-by-zero vulnerability in the Linux kernel's AD9834 Direct Digital Synthesis (DDS) driver, specifically within the `ad9834_write_frequency()` function in the staging IIO frequency subsystem. The flaw occurs when `clk_get_rate()` returns zero, which is not properly handled before calling `ad9834_calc_freqreg()`, leading to a division by zero. The existing check `if (fout > (clk_freq / 2))` fails to protect against this condition when `fout` is zero. The function receives `fout` from user-supplied text buffers via `ad9834_write()`, allowing arbitrary values to trigger the vulnerability. This represents a local attack vector where authenticated users with low privileges can cause system instability through integrity and availability impacts.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
HIGH 7.1
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 switches or SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 and XCM-/XRM-/XCH-/XRH-300 family industrial Ethernet switches. System administrators responsible for industrial control system security, OT security teams, and network engineers managing critical infrastructure networks should prioritize patching. Organizations with local user access to these devices face elevated risk of service disruption.

Technical summary

The vulnerability exists in `ad9834_write_frequency()` where `clk_get_rate()` may return zero, causing division by zero in `ad9834_calc_freqreg()`. The frequency value `fout` is sourced from user-controlled text buffers through `ad9834_write()`, with insufficient validation before mathematical operations. The existing bounds check `if (fout > (clk_freq / 2))` does not prevent the zero-division condition when `clk_freq` is zero. This affects Siemens industrial networking products running vulnerable Linux kernel versions with the AD9834 driver enabled.

Defensive priority

HIGH

Recommended defensive actions

  • Apply vendor-provided firmware updates to V3.2 or later for affected Siemens RUGGEDCOM and SCALANCE products
  • For SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, consult vendor documentation for specific configuration guidance
  • Implement network segmentation to limit access to industrial control system devices
  • Follow CISA recommended practices for industrial control systems defense in depth
  • Monitor for anomalous local access attempts to affected devices
  • Review and restrict local user privileges on affected systems where possible

Evidence notes

The vulnerability description indicates this is a kernel driver issue in the staging IIO frequency subsystem for the AD9834 DDS chip. The flaw stems from insufficient input validation when processing frequency values from user space. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H) confirms local attack vector with low attack complexity, requiring low privileges but no user interaction, with high impact to integrity and availability but no confidentiality impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-47663 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-47663

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

  • CVE-2024-47663 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-47663

    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.