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PatchSiren cyber security CVE debrief

CVE-2024-35922 Siemens CVE debrief

CVE-2024-35922 is a division-by-zero vulnerability in the Linux kernel's framebuffer monitor (fbmon) subsystem, specifically within the fb_videomode_from_videomode() function. The vulnerability was published on April 9, 2024, and affects Siemens SIMATIC S7-1500 TM MFP industrial control systems through their GNU/Linux subsystem. The flaw can be triggered when processing video mode parameters, leading to a local denial-of-service condition. The CVSS 3.1 score of 5.5 (MEDIUM) reflects local attack vector, low attack complexity, and low privileges required, with high availability impact but no confidentiality or integrity impact. Siemens has not released a patch as of the source document's last modification on May 14, 2026. The advisory recommends limiting interactive shell access to trusted personnel and only running applications from trusted sources as interim mitigations.

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, OT security engineers, and asset owners using Siemens SIMATIC S7-1500 TM MFP controllers with the GNU/Linux subsystem. Organizations in manufacturing, process control, and critical infrastructure sectors should prioritize access restrictions until a patch is released.

Technical summary

The vulnerability exists in the fb_videomode_from_videomode() function within the Linux kernel's framebuffer monitor (fbmon) code. A division-by-zero condition can occur when processing video mode timing parameters, resulting in a kernel crash and local denial-of-service. The attack requires local access with low privileges and no user interaction. The flaw does not enable privilege escalation, information disclosure, or code execution. Affected systems are Siemens SIMATIC S7-1500 TM MFP programmable logic controllers with the optional GNU/Linux subsystem enabled. No vendor patch is currently available; mitigation relies on access controls and trusted application execution.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem to authorized personnel only
  • Implement application whitelisting to ensure only trusted applications execute on affected systems
  • Monitor for anomalous framebuffer or video subsystem activity in system logs
  • Apply vendor patches when released by Siemens ProductCERT
  • Review and implement CISA ICS recommended practices for defense-in-depth
  • Segment industrial control networks to limit lateral movement potential

Evidence notes

The vulnerability description is sourced directly from the CISA CSAF advisory ICSA-24-102-01, which references Siemens SSA-265688. The affected product is explicitly identified as the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP. The CVSS vector confirms local attack requirements and denial-of-service impact only. No fix availability is stated in the remediation section of the source advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-35922 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-35922

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

  • CVE-2024-35922 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-35922

    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.