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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-46677 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-46677

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-46677 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-46677

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-226-07.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-355557.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-355557.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-07

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

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.