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PatchSiren cyber security CVE debrief

CVE-2024-26935 Siemens CVE debrief

A vulnerability in the Linux kernel's SCSI core subsystem could allow a local attacker to cause a denial of service condition. The issue stems from a regression where procfs host directories are not properly removed, leading to resource exhaustion over time. This affects Siemens SIMATIC S7-1500 TM MFP devices that utilize the GNU/Linux subsystem. The vulnerability requires local access with low privileges and no user interaction, making it exploitable by authenticated users with shell access to the affected subsystem.

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

Organizations operating Siemens SIMATIC S7-1500 TM MFP devices with the GNU/Linux subsystem enabled, particularly in industrial automation and control system environments where high availability is critical.

Technical summary

The vulnerability exists in the SCSI core subsystem of the Linux kernel where procfs host directories are not properly removed, causing a regression that can lead to resource exhaustion. This is classified under CWE-770: Allocation of Resources Without Limits or Throttling. The affected product is the GNU/Linux subsystem within Siemens SIMATIC S7-1500 TM MFP industrial control devices. No fix is currently available from the vendor.

Defensive priority

medium

Recommended defensive actions

  • Limit access to the interactive shell of the additional GNU/Linux subsystem to trusted personnel only
  • Only build and run applications from trusted sources
  • Monitor for patch availability from Siemens for the SIMATIC S7-1500 TM MFP GNU/Linux subsystem
  • Apply defense-in-depth strategies for industrial control systems per CISA guidance

Evidence notes

The vulnerability was resolved in the Linux kernel with a fix for unremoved procfs host directory regression. Siemens has confirmed this affects the GNU/Linux subsystem of SIMATIC S7-1500 TM MFP devices. The CVSS 3.1 vector indicates local attack vector with low attack complexity, low privileges required, no user interaction, and high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26935 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26935

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

  • CVE-2024-26935 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26935

    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.