PatchSiren cyber security CVE debrief

CVE-2023-52598 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's s390/ptrace subsystem where the Floating-Point Control (FPC) register was not being handled correctly during ptrace operations. The vulnerability was resolved by implementing proper handling of the FPC register setting. The issue affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches. CISA published this advisory on August 12, 2025, with subsequent updates through February 2026 to correct affected product listings and remove rejected CVEs. The vulnerability is classified as 'Misinformed' impact in the source advisory, indicating potential for incorrect information disclosure or system state manipulation through improper FPC register control.

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 networking infrastructure, particularly those with RUGGEDCOM RST2428P or SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. Security teams managing OT/ICS environments should prioritize firmware updates. System administrators responsible for Linux on IBM Z (s390) architectures should verify kernel patch status.

Technical summary

CVE-2023-52598 is a vulnerability in the Linux kernel's ptrace subsystem for IBM Z (s390) architecture. The issue involves incorrect handling of the Floating-Point Control (FPC) register when set via ptrace operations. The FPC register manages floating-point exception masks, rounding modes, and status flags. Improper validation or handling of this register during process tracing could lead to information disclosure, denial of service, or potentially affect floating-point computation integrity in traced processes. The vulnerability was resolved in the Linux kernel with corrected FPC register setting logic. Siemens industrial networking products utilizing affected kernel versions in SINEC OS are impacted, including RUGGEDCOM RST2428P and multiple SCALANCE X-family switch models.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-613116 for detailed product-specific patch information
Verify SINEC OS version on affected SCALANCE and RUGGEDCOM devices
Apply vendor-provided firmware updates to address the underlying Linux kernel vulnerability
Monitor CISA ICS advisories for additional guidance on industrial control system protections
Implement network segmentation for industrial control systems per CISA recommended practices

Evidence notes

The vulnerability description indicates a kernel-level issue in s390 (IBM Z mainframe architecture) ptrace implementation. The FPC register controls floating-point rounding modes, exception masks, and flags. Improper handling could lead to information disclosure or unexpected floating-point behavior in traced processes. Siemens ProductCERT SSA-613116 is the authoritative source, republished by CISA as ICSA-25-226-15. The advisory underwent four revision cycles, with significant corrections in February 2026 regarding affected product scope.

Official resources

2025-08-12