PatchSiren

PatchSiren cyber security CVE debrief

CVE-2024-35988 Siemens CVE debrief

This CVE addresses a kernel-level defect in the RISC-V architecture's memory management for 64-bit No-MMU (NOMMU) configurations. The TASK_SIZE definition incorrectly limits userspace memory addressing, causing spurious access failures when physical RAM exists above 4GB. This is a local availability impact vulnerability with no confidentiality or integrity impact.

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

Operators of Siemens SIMATIC S7-1500 TM MFP systems utilizing the GNU/Linux subsystem, particularly those with memory configurations exceeding 4GB physical RAM. Industrial control system security teams and asset owners in manufacturing and process industries should assess exposure and implement compensating controls.

Technical summary

The RISC-V kernel's TASK_SIZE definition for 64-bit No-MMU configurations incorrectly constrains userspace memory addressing. On systems with physical RAM above 4GB, this causes spurious failures in userspace access routines. The vulnerability is local to the system with low attack complexity and privilege requirements. No confidentiality or integrity impact; availability impact is rated high per CVSS 3.1. Affects the GNU/Linux subsystem on Siemens SIMATIC S7-1500 TM MFP. No fix is currently available; mitigations include access restriction and trusted application sourcing.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
  • Build and run only applications from trusted sources
  • Monitor for vendor security updates as no patch is currently available
  • Apply defense-in-depth strategies for industrial control systems per CISA guidance
  • Review system memory configurations to assess exposure if physical RAM exceeds 4GB

Evidence notes

The vulnerability stems from an incorrect TASK_SIZE definition in the RISC-V kernel for 64-bit NOMMU systems. When physical RAM extends beyond 4GB, the current definition causes userspace access routines to fail spuriously. This affects the GNU/Linux subsystem on Siemens SIMATIC S7-1500 TM MFP industrial control systems. The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H indicates local attack vector, low attack complexity, low privileges required, no user interaction, and high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-35988 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-35988

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

  • CVE-2024-35988 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-35988

    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.