CVE-2024-26923 Siemens CVE debrief

Who should care

Organizations operating Siemens industrial networking infrastructure, particularly those deploying RUGGEDCOM RST2428P switches or SCALANCE X-family devices in critical infrastructure environments. OT security teams, network administrators, and asset owners in manufacturing, energy, transportation, and other industrial sectors should prioritize assessment and patching.

Technical summary

The vulnerability stems from a race condition between the AF_UNIX socket garbage collector and the connect() system call in the Linux kernel. When these operations interleave improperly, socket objects may be freed while still in use, creating use-after-free conditions. The garbage collector in AF_UNIX is responsible for cleaning up orphaned socket references, but improper synchronization with active connection attempts can lead to premature object destruction. This affects Siemens industrial networking equipment running SINEC OS, which incorporates the vulnerable Linux kernel components. The high attack complexity (AC:H) reflects the timing-dependent nature of race condition exploitation, while the local attack vector (AV:L) indicates the attacker must have local access to the target system.

Defensive priority

HIGH

Recommended defensive actions

• Apply vendor-provided firmware updates to V3.1 or later for affected SCALANCE and RUGGEDCOM devices
• Review network segmentation to limit local access to industrial control systems
• Monitor for anomalous local process behavior on affected devices
• Implement defense-in-depth strategies per CISA ICS recommended practices
• Verify patch deployment across all affected product families including SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 and XCM-/XRM-/XCH-/XRH-300 families

Evidence notes

The vulnerability was disclosed in CISA advisory ICSA-25-226-15 on 2025-08-12, with subsequent updates through 2026-02-25. The source advisory underwent multiple revisions, including corrections to affected product lists and removal of rejected CVEs. The CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) indicates a local attack vector with high attack complexity, requiring low privileges but no user interaction, with high impacts across confidentiality, integrity, and availability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.