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PatchSiren cyber security CVE debrief

CVE-2024-26884 Siemens CVE debrief

CVE-2024-26884 is a medium-severity vulnerability in the Linux kernel's BPF (Berkeley Packet Filter) hashtab implementation, specifically affecting 32-bit architectures. The flaw involves an incorrect overflow check that could lead to denial of service conditions. Siemens has identified this vulnerability as affecting the GNU/Linux subsystem of their SIMATIC S7-1500 TM MFP industrial control product. The vulnerability was published on April 9, 2024, and the advisory has been updated multiple times through September 2025 to include additional related CVEs. No patch is currently available from Siemens; mitigation relies on access controls and trusted application practices.

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 systems with the GNU/Linux subsystem enabled, particularly those in industrial and manufacturing environments where high availability is critical. Security teams responsible for OT/ICS infrastructure should prioritize access controls until a patch becomes available.

Technical summary

The vulnerability exists in the BPF (Berkeley Packet Filter) subsystem's hashtab implementation on 32-bit architectures. An incorrect overflow check could be exploited to cause denial of service. The attack requires local access with low privileges and no user interaction. The vulnerability does not impact confidentiality or integrity, but can result in high availability impact.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
  • Build and run applications exclusively from trusted sources
  • Monitor for future Siemens security advisories for patch availability
  • Apply defense-in-depth strategies per ICS-CERT recommended practices
  • Review and implement CISA ICS recommended practices for industrial control systems

Evidence notes

Vulnerability description and affected product information sourced from CISA CSAF advisory ICSA-24-102-01. CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H confirms local attack vector with low attack complexity and low privileges required, resulting in high availability impact. Remediation status of 'no fix available' and mitigation guidance directly from source advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26884 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26884

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

  • CVE-2024-26884 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26884

    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.