CVE-2026-97631 UEFI Vulnerability Affects Network Boot Devices

CVE-2026-97631 UEFI Vulnerability Affects Network Boot Devices

October 27, 2026 Rachel Kim – Technology Editor Technology

Code-Execution Flaw in UEFI Firmware Threatens Servers Worldwide

A newly disclosed code-execution vulnerability designated as CVE-2026-97631 affects Unified Extensible Firmware Interface (UEFI) firmware, Ars Technica reported. The security flaw specifically targets machines that boot from local networks or Internet-connected resources rather than standard disk drives, leaving home users and small office setups unaffected.

The Tech TL;DR:

  • The Vulnerability: CVE-2026-97631 allows arbitrary code execution via network boot functions in specific UEFI implementations.
  • The Blast Radius: Enterprise servers using EDK2-based firmware with PXE functionality enabled by default are primarily at risk.

Vulnerability Exploits EDK2 Reference Implementation PXE Functionality

The vulnerability exists within firmware relying on the EDK2 reference implementation rather than alternative firmware bases, specifically exploiting Preboot Execution Environment (PXE) functionality that ships enabled by default. According to documentation from the TianoCore Project, each Intel-supplied UEFI development kit provides a fully validated implementation for a specific revision of the EDK II source, though many manufacturer implementations diverge.

Intel stated in an email that none of its commercial products currently under security support are known to be affected. The company noted that it does not include the affected EDK2 functionality in its reference code directly, though acknowledging it may be integrated independently by original equipment manufacturer (OEM) board vendors or system manufacturers. Intel advised customers to check with their system manufacturer for specific mitigation guidance, despite public reference code containing EDK2 references.

Arm Denies Impact While Other Manufacturers Remain Silent

Arm reported that CVE-2026-97631 is not directly applicable to its product portfolio, though firmware made available by the company borrows heavily from EDK2, a reliance also documented by TianoCore. While certain hardware platforms might operate free of EDK2 code, security researchers recommend that administrators of all server environments investigate potential exposure.

Requests for comment sent to AMD, Phoenix Technologies, AMI, Microsoft, and Amazon went unanswered before publication. Representatives from the TianoCore Project also did not respond to inquiries regarding the widespread adoption of the vulnerable codebase across enterprise architectures. Without concrete disclosure from major hardware vendors and cloud providers regarding their internal EDK2 integration, determining the exact subset of vulnerable devices remains challenging for systems administrators.

# Check network boot configurations and PXE status
ipmitool chassis bootparam get 5

Disclaimer: The technical analyses and security protocols detailed in this article are for informational purposes only. Always consult with certified IT and cybersecurity professionals before altering enterprise networks or handling sensitive data.

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