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PatchSiren cyber security CVE debrief

CVE-2024-35897 Siemens CVE debrief

A vulnerability in the Linux kernel's netfilter nf_tables subsystem could allow a local attacker to cause a denial of service condition. The issue occurs when table flag updates are not properly discarded when a basechain deletion is pending. Hook unregistration is deferred to the commit phase, as are hook updates triggered by the table dormant flag. When both operations are combined, this results in deleting a basechain while leaving its hook still registered in the core, leading to an inconsistent state.

Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2024-05-19
Original CVE updated
2026-08-04
Advisory published
2024-05-19
Advisory updated
2026-08-04

Who should care

Organizations operating Siemens SIMATIC S7-1500 TM MFP systems with the GNU/Linux subsystem enabled, particularly in industrial control and automation environments where system availability is critical. System administrators responsible for securing OT/ICS infrastructure should prioritize access controls until a patch becomes available.

Technical summary

The vulnerability exists in the Linux kernel's netfilter nf_tables subsystem where improper handling of deferred operations can lead to a use-after-free or dangling hook scenario. When a basechain is deleted while a table flag update (such as the dormant flag) is pending, the hook may remain registered in the core after the chain has been freed. This inconsistency can cause system instability or denial of service. The issue was fixed by discarding table flag updates when a basechain deletion is pending, ensuring proper synchronization between hook registration state and chain lifecycle.

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 vendor security updates as no patch is currently available
  • Apply defense-in-depth strategies for industrial control systems per CISA guidance

Evidence notes

The vulnerability was resolved in the Linux kernel by discarding table flag updates when a basechain deletion is pending. Siemens has identified this vulnerability as affecting the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP industrial control system. The CVSS 3.1 vector indicates local attack vector with low attack complexity, requiring low privileges and no user interaction, resulting in high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-35897 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-35897

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

  • CVE-2024-35897 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-35897

    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.