PatchSiren cyber security CVE debrief

CVE-2023-51780 Siemens CVE debrief

A use-after-free vulnerability exists in the Linux kernel's ATM (Asynchronous Transfer Mode) networking subsystem. The flaw resides in do_vcc_ioctl within net/atm/ioctl.c, triggered by a race condition between vcc_recvmsg operations. This vulnerability affects Linux kernel versions prior to 6.6.8. The issue has been identified in Siemens industrial networking products running affected kernel versions, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches. The vulnerability stems from improper synchronization during ATM socket operations, where a socket structure may be freed while still being accessed by concurrent receive message handling.

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 RUGGEDCOM RST2428P switches or SCALANCE X-family industrial Ethernet switches in critical infrastructure, manufacturing, or utility environments. Security teams managing Linux-based industrial control systems with ATM networking components. Network administrators responsible for patch management in OT/ICS environments.

Technical summary

The vulnerability is a use-after-free condition in the Linux kernel's ATM (Asynchronous Transfer Mode) implementation. The affected function do_vcc_ioctl in net/atm/ioctl.c fails to properly handle concurrent access during vcc_recvmsg operations, allowing a race condition that can lead to memory corruption. This is classified under CWE-416 (Use After Free). The flaw was resolved in Linux kernel 6.6.8. Siemens has incorporated this fix into SINEC OS 3.1 and later versions for affected SCALANCE and RUGGEDCOM product families.

Defensive priority

medium

Recommended defensive actions

Update affected Siemens devices to SINEC OS 3.1 or later, as versions below 3.1 are no longer supported for SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family per advisory revision history
Apply Linux kernel updates to version 6.6.8 or later to address the underlying use-after-free vulnerability in net/atm/ioctl.c
Review network segmentation for ATM protocol usage in industrial control environments
Monitor Siemens ProductCERT advisory SSA-613116 for additional product-specific guidance
Implement defense-in-depth strategies for industrial control systems per CISA recommended practices

Evidence notes

CVE published 2025-08-12 per CISA CSAF advisory ICSA-25-226-15. Advisory modified 2026-02-25 with republication based on Siemens ProductCERT SSA-613116. Source indicates impact assessment as 'Misinformed' for affected product IDs. Kernel fix available in 6.6.8 and later.

Official resources

2025-08-12