PatchSiren cyber security CVE debrief

CVE-2023-52835 Siemens CVE debrief

CVE-2023-52835 is a vulnerability in the Linux kernel's perf/core subsystem related to out-of-bounds AUX (auxiliary) area requests. The vulnerability was resolved by adding an early bail-out check when the requested AUX area is out of bounds. This fix prevents potential security issues that could arise from improper bounds checking in the performance monitoring subsystem. The vulnerability affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. The issue was initially published on August 12, 2025, with subsequent modifications through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs from related advisories.

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 including SCALANCE XC/XR series switches and RUGGEDCOM RST2428P devices. Security teams responsible for OT/ICS environments should prioritize monitoring vendor advisories and implementing defense-in-depth controls pending patch availability.

Technical summary

The vulnerability exists in the Linux kernel's performance monitoring (perf) core subsystem. The AUX (auxiliary) area is used for storing trace data from performance monitoring units. The issue occurs when a requested AUX area extends beyond valid memory boundaries. The resolution adds an early validation check that bails out before processing out-of-bounds requests, preventing potential memory safety issues. This vulnerability class is associated with CWE-125 (Out-of-bounds Read). The affected Siemens products utilize SINEC OS, which incorporates the vulnerable Linux kernel components.

Defensive priority

medium

Recommended defensive actions

Apply vendor-provided firmware updates for affected Siemens SCALANCE and RUGGEDCOM devices when available
Review and implement CISA ICS recommended practices for defense-in-depth strategies
Monitor Siemens ProductCERT advisories for updated remediation guidance
Implement network segmentation for industrial control systems to limit exposure
Apply principle of least privilege for access to performance monitoring interfaces

Evidence notes

The vulnerability description indicates a bounds checking issue in the Linux kernel perf/core subsystem. The fix implements early validation of AUX area requests to prevent out-of-bounds access. Siemens ProductCERT advisory SSA-613116 provides the authoritative product-specific guidance.

Official resources

The vulnerability was disclosed through coordinated disclosure via CISA and Siemens ProductCERT. The advisory was initially published on August 12, 2025, with multiple updates through February 2026 to correct product impact assessments.