PatchSiren cyber security CVE debrief

CVE-2024-46832 Siemens CVE debrief

A vulnerability in the Linux kernel's MIPS cevt-r4k timer driver could cause a BUG warning when get_c0_compare_int is called on secondary CPUs in invalid context. The issue stems from improper handling of timer IRQ installation during CPU bring-up, potentially triggering sleeping function warnings in mutex operations. Siemens has assessed this vulnerability as 'Misinformed' impact for affected industrial networking products, indicating the reported severity may not accurately reflect actual risk to operational environments. The vulnerability affects SINEC OS-based products including RUGGEDCOM RST2428P and SCALANCE X-family switches.

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 RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, or SCALANCE XCM-/XRM-/XCH-/XRH-300 family switches with SINEC OS should monitor vendor guidance, though vendor assessment indicates low operational risk.

Technical summary

The vulnerability exists in the MIPS cevt-r4k (R4000-class) clock event driver where get_c0_compare_int() is called during timer IRQ installation on secondary CPUs. This call occurs in an invalid context that can trigger a BUG warning for sleeping functions (specifically mutex operations at kernel/locking/mutex.c:283). The fix avoids calling get_c0_compare_int when the timer IRQ is already installed and removes unnecessary IRQ number storage in struct clock_event_device, which per kernel comments is only intended for non-CPU-local devices. Siemens has determined this vulnerability's impact is 'Misinformed' for affected products, suggesting the original CVE assessment does not accurately characterize risk to their industrial networking platforms.

Defensive priority

low

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-355557 for current product-specific guidance
Verify SINEC OS version and applicable security patches through Siemens support channels
Monitor CISA ICS advisories for any updates to impact assessment
Apply defense-in-depth practices for industrial control systems per CISA guidance

Evidence notes

Source CISA CSAF advisory ICSA-25-226-07, republished 2026-02-25 based on Siemens ProductCERT SSA-355557. Siemens threat assessment categorizes impact as 'Misinformed' for all listed product IDs (CSAFPID-0006, CSAFPID-0002, CSAFPID-0003). No CVSS vector provided in source.

Official resources

2025-08-12