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CVE-2024-56631 Siemens CVE debrief

A use-after-free vulnerability in the Linux kernel's SCSI generic (sg) driver affects Siemens SIMATIC S7-1500 TM MFP industrial control systems. The flaw resides in sg_release(), where improper sequencing of resource cleanup and mutex operations can lead to slab-use-after-free conditions. Discovered by syzbot with KASAN detection, this vulnerability allows a local attacker with low privileges to potentially achieve code execution, confidentiality breach, or system availability impact. The CVSS 3.1 score of 7.8 reflects high impacts across confidentiality, integrity, and availability with local attack vector and low attack complexity. No patch is currently available from Siemens for the affected GNU/Linux subsystem.

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
2026-07-14
Original CVE updated
2026-07-28
Advisory published
2026-07-14
Advisory updated
2026-07-28

Who should care

Industrial control system operators, OT security teams, Siemens SIMATIC S7-1500 TM MFP administrators, critical infrastructure defenders, and organizations with embedded Linux systems in operational technology environments

Technical summary

The vulnerability exists in the SCSI generic (sg) driver's sg_release() function in the Linux kernel. A race condition between resource cleanup and mutex operations permits access to freed slab memory. The flaw was detected by Google's syzbot fuzzing infrastructure using Kernel Address Sanitizer (KASAN). Successful exploitation requires local access with low privileges and no user interaction. The upstream Linux kernel fix ensures proper sequencing of cleanup operations to prevent use-after-free conditions. Siemens has not yet released a patch for the SIMATIC S7-1500 TM MFP GNU/Linux subsystem as of the latest advisory update.

Defensive priority

HIGH

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
  • Build and execute only applications from trusted sources
  • Monitor for anomalous process behavior or unexpected kernel panics on affected systems
  • Apply Siemens security updates when released per advisory ICSA-24-102-01
  • Implement network segmentation to limit access to affected industrial control systems

Evidence notes

Vulnerability confirmed through syzbot KASAN detection with validated fix in upstream Linux kernel. Siemens CSAF advisory ICSA-24-102-01 documents affected product. No known exploitation in the wild.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-56631 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-56631

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

  • CVE-2024-56631 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-56631

    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.