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CVE-2024-45021 Siemens CVE debrief

A vulnerability in the Linux kernel's memory cgroup event control mechanism (memcg_write_event_control) allows a local, authenticated user to trigger a kernel oops (denial of service). The flaw exists in how the kernel handles event control file descriptors for memory cgroups. Affected Siemens industrial networking products incorporate vulnerable Linux kernel versions in their SINEC OS firmware. Successful exploitation results in system instability and potential service interruption. The vulnerability requires local access and low privileges, with no confidentiality or integrity impact, but high availability impact.

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 industrial Ethernet switches in critical infrastructure, manufacturing, or utility environments. System administrators responsible for OT/ICS network security and availability should prioritize patching during maintenance windows.

Technical summary

The vulnerability resides in memcg_write_event_control(), a Linux kernel function handling memory cgroup event notifications. Insufficient validation of user-supplied input allows a local attacker with low privileges to trigger a kernel oops, causing denial of service. The flaw is classified as CWE-20 (Improper Input Validation). Siemens industrial networking products running SINEC OS incorporate affected kernel versions. The CVSS 3.1 base score is 5.5 (Medium), with attack vector local, attack complexity low, privileges required low, and no user interaction needed. Impact is limited to availability (High); confidentiality and integrity are unaffected.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided firmware updates: Update RUGGEDCOM RST2428P and SCALANCE XCM-/XRM-/XCH-/XRH-300 family to V3.2 or later. For SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, consult Siemens ProductCERT SSA-355
  • Implement defense-in-depth controls for industrial control systems per CISA recommended practices
  • Restrict local access to affected devices to authorized personnel only
  • Monitor for anomalous system crashes or unexpected reboots on affected devices
  • Review and apply Siemens security advisory SSA-355557 guidance for affected product configurations

Evidence notes

CVE published 2025-08-12 per CISA CSAF advisory ICSA-25-226-07. Modified 2026-02-25. Advisory republished by CISA based on Siemens ProductCERT SSA-355557. CVSS 3.1 vector: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. CWE-20 (Improper Input Validation) identified.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-45021 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-45021

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

  • CVE-2024-45021 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-45021

    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.