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CVE-2024-42292 Siemens CVE debrief

CVE-2024-42292 is a medium-severity out-of-bounds (OOB) memory access vulnerability in the Linux kernel's kobject_uevent subsystem, specifically within the zap_modalias_env() function. The flaw stems from an incorrect size calculation when moving memory blocks during MODALIAS environment variable processing. If MODALIAS is not the last variable in the environment parameter, the miscalculation causes memory access beyond allocated boundaries. This vulnerability was resolved by correcting the size parameter passed to memmove(). Siemens has identified this vulnerability as affecting the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP industrial control system. The vulnerability was published on April 9, 2024, and the advisory was last modified on May 14, 2026, with multiple updates adding additional CVEs to the same advisory over time. No patch is currently available from Siemens; mitigations focus on restricting access to trusted personnel and ensuring only trusted applications are executed.

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 enabled GNU/Linux subsystems, particularly in industrial and OT environments where system availability is critical. Security teams responsible for ICS/OT infrastructure, system integrators, and asset owners in manufacturing, process control, and critical infrastructure sectors should prioritize access controls until a patch becomes available.

Technical summary

The vulnerability exists in zap_modalias_env() within the Linux kernel's kobject_uevent implementation. The function incorrectly calculates the size of memory blocks to move when processing the MODALIAS environment variable. When MODALIAS is not the final variable in the environment block, this miscalculation causes memmove() to access memory outside the intended bounds. The fix corrects the size calculation passed to memmove(). This is a local vulnerability requiring low privileges with high availability impact potential.

Defensive priority

medium

Recommended defensive actions

  • Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
  • Ensure only applications from trusted sources are built and executed on affected systems
  • Monitor for security updates from Siemens for future patch availability
  • Apply defense-in-depth strategies for industrial control systems per CISA guidance
  • Review and implement ICS-CERT recommended practices for securing industrial control systems

Evidence notes

Vulnerability description and affected product information derived from CISA CSAF advisory ICSA-24-102-01. CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H indicates local attack vector with low attack complexity, requiring low privileges, resulting in high availability impact. Remediation status confirmed as 'none_available' in source advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-42292 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-42292

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

  • CVE-2024-42292 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-42292

    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.