PatchSiren cyber security CVE debrief

CVE-2024-46677 Siemens CVE debrief

A NULL pointer dereference vulnerability exists in the Linux kernel's GTP (GPRS Tunneling Protocol) implementation. When sockfd_lookup() fails, gtp_encap_enable_socket() returns a NULL pointer, but its callers only check for error pointers, missing the NULL pointer case. This flaw can lead to a denial of service condition through local exploitation. The vulnerability affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE switch families.

Vendor: Siemens
Product: RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS: MEDIUM 5.5
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 RUGGEDCOM RST2428P switches and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 and XCM-/XRM-/XCH-/XRH-300 families. Critical infrastructure operators, manufacturing facilities, and utility providers using affected products in operational technology environments should prioritize assessment and patching.

Technical summary

The vulnerability resides in the Linux kernel's GTP (GPRS Tunneling Protocol) subsystem. The function gtp_encap_enable_socket() can return NULL when sockfd_lookup() fails, but calling code only checks for error pointers (IS_ERR), not NULL pointers. This coding error leads to a NULL pointer dereference that can crash the kernel. The CVSS 3.1 vector indicates local attack vector with low attack complexity, requiring low privileges and resulting in high availability impact. The vulnerability is rated MEDIUM severity with a base score of 5.5.

Defensive priority

medium

Recommended defensive actions

Apply vendor-provided firmware updates to V3.2 or later for affected RUGGEDCOM and SCALANCE products
For SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, consult vendor documentation for specific configuration guidance
Implement network segmentation to limit exposure of affected industrial control systems
Monitor vendor security advisories for additional affected product announcements
Apply defense-in-depth strategies per CISA ICS recommended practices

Evidence notes

CVE published 2025-08-12; CISA advisory ICSA-25-226-07 published same date. Siemens ProductCERT advisory SSA-355557 referenced as authoritative source. Advisory modified 2026-02-25 with republication based on updated Siemens guidance.

Official resources

2025-08-12