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PatchSiren cyber security CVE debrief

CVE-2024-35933 Siemens CVE debrief

A null pointer dereference vulnerability exists in the Linux kernel's Bluetooth Intel driver (btintel). The flaw occurs in the btintel_read_version function, which can dereference a null pointer under certain conditions, leading to a kernel crash and denial of service. The vulnerability requires local access with low privileges and no user interaction, making it exploitable by authenticated users on the affected system.

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 industrial control systems with the GNU/Linux subsystem enabled, as well as any Linux systems with Intel Bluetooth hardware utilizing the vulnerable btintel driver. System administrators responsible for industrial control system security and availability should prioritize access controls given the current lack of available patches.

Technical summary

The btintel_read_version function in the Linux kernel's Bluetooth Intel driver fails to properly validate pointer references before dereferencing, resulting in a null pointer dereference condition. This flaw can be triggered by local users with low privileges, causing kernel panic and system unavailability. The vulnerability affects systems utilizing Intel Bluetooth hardware with the btintel driver, including the GNU/Linux subsystem of Siemens SIMATIC S7-1500 TM MFP industrial controllers.

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 kernel crashes or unexpected Bluetooth subsystem failures that may indicate exploitation attempts
  • Apply vendor patches when available, as the advisory currently indicates no fix is available
  • Implement defense-in-depth strategies for industrial control systems per CISA guidance

Evidence notes

The vulnerability description indicates this is a null pointer dereference fix in the btintel_read_version function within the Linux kernel Bluetooth subsystem. The CVSS 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. The source advisory (ICSA-24-102-01) from CISA provides official government-sourced confirmation of this vulnerability affecting Siemens industrial control products.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-35933 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-35933

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

  • CVE-2024-35933 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-35933

    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.