PatchSiren cyber security CVE debrief

CVE-2022-48655 Siemens CVE debrief

CVE-2022-48655 is a HIGH severity vulnerability (CVSS 8.1) in the Linux kernel's ARM SCMI firmware subsystem. The issue involves missing bounds checking when accessing reset domain descriptors by index, which could lead to out-of-bounds memory access if an SCMI driver misbehaves. The vulnerability was resolved by adding internal consistency checks before accessing domain descriptors. Siemens has identified this vulnerability as affecting certain industrial networking products including the RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. A vendor fix is available requiring update to version 3.1 or later. The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. This CVE is not listed in CISA's Known Exploited Vulnerabilities catalog.

Vendor: Siemens
Product: RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS: HIGH 8.1
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 equipment including SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family switches and RUGGEDCOM RST2428P devices. Critical infrastructure operators in manufacturing, energy, and transportation sectors utilizing these devices for industrial network infrastructure. Security teams responsible for OT/ICS environment patch management and vulnerability remediation.

Technical summary

The vulnerability exists in the Linux kernel's ARM System Control and Management Interface (SCMI) firmware subsystem. The SCMI reset operations interface allows drivers to access reset domain descriptors by index. Without proper bounds validation, a misbehaving SCMI driver could request an invalid index, resulting in out-of-bounds memory access. The fix implements internal consistency checks to validate index values before accessing domain descriptor arrays. This represents a classic missing bounds check vulnerability (CWE-125) in kernel firmware interfaces.

Defensive priority

HIGH

Recommended defensive actions

Apply vendor-provided firmware updates to version 3.1 or later for affected Siemens SCALANCE and RUGGEDCOM devices
Review and implement CISA ICS recommended practices for defense-in-depth strategies
Monitor network traffic to and from affected industrial control systems for anomalous behavior
Ensure proper network segmentation between IT and OT environments
Validate that SCMI driver implementations include proper bounds checking

Evidence notes

Vulnerability description sourced from CISA CSAF advisory ICSA-25-226-15. Affected product identification and remediation guidance derived from Siemens ProductCERT advisory SSA-613116 as republished by CISA. CVSS vector confirms network attack vector with high attack complexity, no privileges required, and high impacts to confidentiality, integrity, and availability.

Official resources

2025-08-12