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CVE-2024-42223 Siemens CVE debrief

CVE-2024-42223 is a medium-severity integer overflow vulnerability in the Linux kernel's DVB frontend driver for the TDA10048 demodulator. The flaw occurs because `state->xtal_hz` can reach up to 16 MHz, and when multiplied by `pll_mfactor`, the result can overflow a 32-bit integer. This vulnerability was published on August 12, 2025, and last modified on February 25, 2026. Siemens has identified this CVE as affecting certain industrial networking products that incorporate third-party Linux kernel components, specifically the RUGGEDCOM RST2428P and SCALANCE X family switches running SINEC OS. However, per the CISA CSAF advisory, the actual impact is categorized as 'Misinformed' for the affected product IDs, suggesting the vulnerability may not be exploitable in the specific Siemens product configurations. The advisory has undergone multiple revisions, with the most recent update on February 25, 2026, reflecting ongoing analysis and clarification of affected product scope. Organizations should verify their specific product configurations against Siemens' official security advisory and apply vendor-provided updates when available.

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 infrastructure, particularly RUGGEDCOM and SCALANCE X-series switches running SINEC OS. Security teams responsible for OT/ICS asset management and vulnerability management programs. System integrators and operators of industrial control systems utilizing Siemens networking components.

Technical summary

The vulnerability exists in the `tda10048` DVB frontend driver within the Linux kernel media subsystem. The `state->xtal_hz` field, representing crystal oscillator frequency, can hold values up to 16 MHz. When this value is multiplied by `pll_mfactor` (PLL multiplication factor) during tuner configuration calculations, the mathematical result can exceed the maximum value representable by a 32-bit signed integer (2,147,483,647), causing an integer overflow. This overflow could lead to incorrect PLL configuration, potentially causing tuner malfunction or undefined behavior in DVB signal processing. The flaw is classified as CWE-20 (Improper Input Validation). While the underlying Linux kernel vulnerability exists, Siemens' assessment indicates the impact on their specific product implementations is limited or misinformed, suggesting the vulnerable code path may not be reachable or exploitable in their SINEC OS-based industrial networking equipment.

Defensive priority

medium

Recommended defensive actions

  • Verify whether affected Siemens products (RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family) are deployed in your environment
  • Review Siemens ProductCERT advisory SSA-355557 for definitive affected product and version guidance
  • Apply vendor-provided firmware updates for SINEC OS when available
  • Monitor CISA ICS advisories for additional updates to ICSA-25-226-07
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Validate that DVB frontend functionality is not exposed in operational configurations

Evidence notes

Vulnerability sourced from CISA CSAF advisory ICSA-25-226-07, which references Siemens ProductCERT advisory SSA-355557. The advisory explicitly categorizes impact as 'Misinformed' for affected product IDs (CSAFPID-0006, CSAFPID-0002, CSAFPID-0003). Multiple revision history entries confirm ongoing analysis and scope corrections through February 2026.

Official resources

2025-08-12