PatchSiren cyber security CVE debrief

CVE-2024-46800 Siemens CVE debrief

A use-after-free vulnerability exists in the Linux kernel's netem (network emulator) scheduler. The flaw occurs in netem_dequeue() when a packet is enqueued to an inner queueing discipline (qdisc) that returns __NET_XMIT_STOLEN, potentially leading to memory corruption. This vulnerability affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE switch families. The vulnerability requires local access with low privileges to exploit, and successful exploitation results in high availability impact (denial of service) with no confidentiality or integrity impact. Siemens has released firmware updates to address this issue.

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 RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500, or SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices in industrial control environments. System administrators responsible for network infrastructure in manufacturing, energy, transportation, and critical infrastructure sectors using affected Siemens networking equipment.

Technical summary

The vulnerability exists in the sch/netem component of the Linux kernel. When netem_dequeue() enqueues a packet to an inner qdisc and that qdisc returns __NET_XMIT_STOLEN, a use-after-free condition can occur. This memory safety flaw could allow a local attacker with low privileges to trigger a denial of service condition. The CVSS 3.1 score of 5.5 (MEDIUM) reflects the local attack vector and high availability impact with no confidentiality or integrity effects. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog.

Defensive priority

medium

Recommended defensive actions

Apply vendor firmware updates: Update RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices to version 3.2 or later.
For SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, consult Siemens ProductCERT advisory SSA-355557 for specific configuration guidance and available updates.
Implement network segmentation to limit local access to affected industrial control devices.
Monitor for anomalous network behavior or unexpected device reboots that may indicate exploitation attempts.
Follow CISA ICS recommended practices for defense-in-depth strategies in industrial control environments.

Evidence notes

Vulnerability disclosed via CISA ICS advisory ICSA-25-226-07 based on Siemens ProductCERT advisory SSA-355557. The flaw originates in the Linux kernel's sch/netem component. CVSS 3.1 vector confirms local attack vector with low attack complexity and low privileges required.

Sources and references

Verified primary and authoritative sources

CVE-2024-46800 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2024-46800

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2024-46800 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2024-46800

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.