PatchSiren cyber security CVE debrief

CVE-2023-52840 Siemens CVE debrief

A use-after-free vulnerability in the Linux kernel's Synaptics RMI4 input driver was resolved via a fix in rmi_unregister_function(). The vulnerability 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 revisions through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. The source advisory categorizes the impact as 'Misinformed' for affected product IDs. No CVSS score or severity rating is available in the source corpus. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

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 SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family, or RUGGEDCOM RST2428P industrial networking equipment; OT security teams managing SINEC OS deployments; critical infrastructure operators with Siemens industrial Ethernet infrastructure

Technical summary

The vulnerability exists in the rmi_unregister_function() routine of the Linux kernel's Synaptics RMI4 (Remote Management Interface) input driver. A use-after-free condition can occur during function unregistration, potentially leading to memory corruption. The fix ensures proper memory management during the teardown path. This kernel-level vulnerability is exposed through Siemens' SINEC OS operating system used in industrial Ethernet switches.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-613116 for detailed affected product versions and patch availability
Apply vendor-provided firmware updates for SINEC OS on affected SCALANCE and RUGGEDCOM devices
Verify device inventory against corrected affected product list from February 2026 advisory revision
Implement network segmentation for industrial control systems per CISA recommended practices
Monitor for anomalous input device behavior on affected systems as potential exploitation indicator

Evidence notes

CVE published 2025-08-12; modified 2026-02-25. Advisory ICSA-25-226-15 underwent four revisions, with the latest on 2026-02-25 reflecting updates from Siemens ProductCERT SSA-613116. Impact categorized as 'Misinformed' in source CSAF data. Not a KEV-listed vulnerability.

Official resources

2025-08-12