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CVE-2024-42276 Siemens CVE debrief

A vulnerability in the Linux kernel's NVMe PCI driver could allow a local, privileged attacker to cause a denial of service (DoS) condition. The issue stems from a missing condition check in nvme_unmap_data() that fails to verify the existence of mapped data before dereferencing, potentially leading to a NULL pointer dereference. The vulnerability was resolved by ensuring nvme_unmap_data() applies the same conditional logic as nvme_map_data(), which is only called when a request has physical segments. Siemens has identified this vulnerability as affecting the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP industrial control system. No patch is currently available from Siemens; mitigation relies on restricting access to trusted personnel and running only trusted applications.

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
2024-08-17
Original CVE updated
2026-08-04
Advisory published
2024-08-17
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 and OT environments where high availability is critical. System administrators responsible for securing embedded Linux environments on industrial controllers should prioritize access controls until a patch becomes available.

Technical summary

The vulnerability exists in the nvme-pci driver of the Linux kernel. The function nvme_map_data() is invoked only when a request contains physical segments, but the corresponding nvme_unmap_data() function lacked an equivalent condition check. This inconsistency could result in dereferencing NULL or invalid pointers when unmapping data that was never mapped, leading to a kernel crash and system availability impact. The fix ensures nvme_unmap_data() mirrors the conditional logic of nvme_map_data().

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
  • Ensure only applications from trusted sources are built and executed on the affected subsystem
  • Monitor for kernel updates from Siemens that address this vulnerability in the GNU/Linux subsystem
  • Apply defense-in-depth strategies for industrial control systems per CISA guidance
  • Review and implement ICS-CERT recommended practices for securing industrial control environments

Evidence notes

The vulnerability description indicates a resolved Linux kernel issue in the nvme-pci driver where nvme_unmap_data() lacked a condition check present in nvme_map_data(). Siemens CSAF data confirms this affects the SIMATIC S7-1500 TM MFP GNU/Linux subsystem. The CVSS vector AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H indicates local attack vector, low attack complexity, high privileges required, no user interaction, and high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-42276 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-42276

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

  • CVE-2024-42276 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-42276

    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.