PatchSiren cyber security CVE debrief

CVE-2024-26752 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's L2TP (Layer 2 Tunneling Protocol) subsystem where an incorrect message length was passed to the `ip6_append_data` function. The vulnerability was resolved by correcting the message length parameter passed during IPv6 packet construction in L2TP. The issue affects Siemens industrial networking products that incorporate the vulnerable Linux kernel code, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS. CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. The vulnerability is classified as 'Misinformed' in the source advisory's threat categorization. No CVSS score or severity rating is available in the provided source data.

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 X-family switches and RUGGEDCOM devices, particularly those utilizing L2TP over IPv6 in operational technology environments.

Technical summary

The vulnerability exists in the Linux kernel's L2TP implementation where the `ip6_append_data` function receives an incorrect message length parameter during IPv6 packet construction. This can lead to improper packet handling. The fix ensures the correct message length is passed to maintain proper IPv6 datagram assembly in L2TP tunnels.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-613116 for detailed product impact and patch availability
Verify SINEC OS version on affected Siemens SCALANCE and RUGGEDCOM devices
Apply vendor-provided firmware updates when available per Siemens security advisory
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

Vulnerability resolved in Linux kernel L2TP subsystem. Affects Siemens SINEC OS-based products including RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, SCALANCE XCM-/XRM-/XCH-/XRH-300 family. Advisory ICSA-25-226-15 published by CISA with multiple revisions through 2026-02-25.

Official resources

2025-08-12