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PatchSiren cyber security CVE debrief

CVE-2024-50134 Siemens CVE debrief

A field-spanning write error in the Linux kernel's drm/vboxvideo driver, affecting the vbva_mouse_pointer_shape structure, has been resolved. The vulnerability stemmed from a fake variable-length array (VLA) at the end of the structure that triggered memcpy safety checks. The fix replaces this with a proper VLA declaration. Siemens has identified this as affecting the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP industrial control product. No patch is currently available from the vendor; mitigations focus on restricting access to trusted personnel and ensuring only trusted applications are executed.

Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2024-04-09
Original CVE updated
2026-05-14
Advisory published
2024-04-09
Advisory updated
2026-05-14

Who should care

Industrial control system operators using Siemens SIMATIC S7-1500 TM MFP with the GNU/Linux subsystem enabled; OT security teams managing manufacturing or process control environments; asset owners responsible for patching Linux-based embedded systems in critical infrastructure

Technical summary

The vulnerability exists in the drm/vboxvideo driver within the Linux kernel, specifically in the vbva_mouse_pointer_shape structure. The original implementation used a fake variable-length array (VLA) at the structure's end, which caused memcpy operations to trigger field-spanning write detection errors. The kernel fix replaces this with a legitimate VLA declaration. The issue affects the GNU/Linux subsystem of Siemens SIMATIC S7-1500 TM MFP industrial controllers. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) indicates a local attack vector requiring low privileges, with high availability impact but no confidentiality or integrity impact. The source notes that the original buffer length calculation appears to be 4 bytes oversized, though this behavior was preserved in the fix.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem of affected Siemens SIMATIC S7-1500 TM MFP devices to trusted personnel only
  • Ensure only applications from trusted sources are built and executed on affected systems
  • Monitor for vendor security advisories from Siemens regarding patch availability for SSA-265688
  • Review and apply CISA ICS recommended practices for defense-in-depth strategies
  • Assess operational technology network segmentation to limit potential local attack vectors

Evidence notes

CVE published 2024-04-09. CISA CSAF advisory ICSA-24-102-01 first published same date, with multiple subsequent releases adding related CVEs through 2025-09-09. Siemens advisory SSA-265688 cross-referenced. CVSS 5.5 (MEDIUM) per source, vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H indicating local attack vector with low complexity, low privileges required, and high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-50134 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-50134

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

  • CVE-2024-50134 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-50134

    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/2024/icsa-24-102-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-265688.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-265688.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-102-01

    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.