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PatchSiren cyber security CVE debrief

CVE-2019-13106 Siemens CVE debrief

CVE-2019-13106 is a high-severity flaw in U-Boot’s ext4 filesystem handling. A crafted ext4 image can cause memset() to write too much data during parsing, leading to a stack buffer overflow. Because U-Boot runs early in the boot chain, successful exploitation can have serious integrity and availability impact, and the NVD record rates confidentiality, integrity, and availability as high.

Vendor
Siemens
Product
RUGGEDCOM ROX MX5000
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-05-14
Advisory published
2026-05-12
Advisory updated
2026-05-14

Who should care

Embedded and IoT device vendors, firmware engineers, bootloader maintainers, and distro or platform teams that ship U-Boot-based systems should pay attention. Teams that boot from removable media, network-delivered images, or other untrusted storage are especially relevant.

Technical summary

The issue is a memory-safety bug in U-Boot’s ext4 reader. When processing a specially crafted ext4 filesystem, memset() can clear beyond the intended stack buffer boundary, producing a stack-based buffer overflow. The published description indicates likely code execution, and NVD maps the weakness to CWE-787.

Defensive priority

High. The attack vector is local and requires user interaction, but the affected component is a bootloader, so compromise can occur very early in system startup and may have outsized security impact.

Recommended defensive actions

  • Inventory all products and images that use U-Boot and check the exact version in use.
  • Upgrade to a non-vulnerable U-Boot release using vendor or upstream guidance.
  • Review firmware update and boot media workflows for exposure to untrusted ext4 images.
  • Prioritize systems that parse removable, externally supplied, or network-fetched boot media.
  • Use trusted, controlled boot assets and validate vendor advisories before deployment.
  • Track downstream advisories for platform-specific backports and fix status.

Evidence notes

The debrief is based on the supplied NVD record and linked references. The CVE description states that U-Boot versions 2016.09 through 2019.07-rc4 can overflow a stack buffer while reading a crafted ext4 filesystem. The NVD CPE criteria also mark U-Boot 2019.07 and 2019.07-rc1 through rc4 as vulnerable, so the exact affected range should be checked against the specific build or backport status. References include an upstream U-Boot mailing list patch and downstream advisories from openSUSE and Siemens.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-13106 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-13106

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

  • CVE-2019-13106 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-13106

    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/2026/icsa-26-134-16.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-577017.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-577017.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-134-16

    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.