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PatchSiren cyber security CVE debrief

CVE-2024-35805 Linux CVE debrief

A denial-of-service vulnerability exists in the Linux kernel's Device Mapper (dm) snapshot subsystem. When a snapshot with many exceptions is exited, the kernel can lock up due to a tight loop in dm_exception_table_exit that lacks scheduling points. The fix adds cond_resched() to yield the CPU during exception cleanup. Siemens has confirmed this affects the GNU/Linux subsystem in SIMATIC S7-1500 TM MFP industrial controllers. No patch is currently available from the vendor; mitigations focus on restricting access to the embedded Linux environment.

Vendor
Linux
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 using the GNU/Linux subsystem; industrial control system security teams; organizations running embedded Linux with dm-snapshot on critical infrastructure

Technical summary

The vulnerability resides in dm_exception_table_exit() in the Linux kernel's Device Mapper snapshot driver. When tearing down a snapshot with numerous exceptions, the cleanup loop runs without yielding, causing a soft lockup. The upstream fix inserts cond_resched() to allow preemption. This affects embedded Linux environments including the GNU/Linux subsystem on Siemens SIMATIC S7-1500 TM MFP programmable logic controllers. Local access with low privileges is required; no confidentiality or integrity impact, high availability impact per CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem on affected Siemens SIMATIC S7-1500 TM MFP devices to trusted personnel only
  • Only build and run applications from trusted sources on the embedded GNU/Linux environment
  • Monitor for vendor security advisories from Siemens for future patch availability
  • Apply defense-in-depth practices for industrial control systems per CISA guidance

Evidence notes

CVE published 2024-04-09 per CVE.org and CISA CSAF advisory ICSA-24-102-01. Siemens advisory SSA-265688 cross-referenced. CVSS 5.5 (MEDIUM) per source. CWE-667 (Improper Locking) identified. No KEV listing. No known ransomware use.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-35805 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-35805

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

  • CVE-2024-35805 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-35805

    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.