Critical 16-Year-Old UEFI Flaw Can Run Code Before Secure Boot on Network-Booting Servers

A vulnerability designated CVE‑2026‑97631 has been disclosed that dates back sixteen years in the Unified Extensible Firmware Interface (UEFI) used by many servers. Because Secure Boot is a cornerstone of firmware‑level integrity, the ability to run code earlier in the boot chain opens a direct path to compromise the operating system and any data it hosts. The Next Web adds that a fix is expected only after several months, underscoring a window of exposure for operators who have not yet applied mitigations. Both outlets stress the urgency of detecting the flaw in existing firmware.

UEFI serves as the interface between server hardware and the operating system, and Secure Boot was introduced to verify that only trusted firmware components load during start‑up. Network booting, common in data‑center provisioning and cloud deployments, fetches the operating system image from a remote server before local storage is accessed. The disclosed flaw subverts this chain by inserting malicious code prior to Secure Boot’s verification step, effectively bypassing the intended protection and allowing attackers to gain control at the earliest stage of system initialization. Stakeholders should monitor vendor advisories for the forthcoming patch referenced in the coverage, and consider interim mitigations such as disabling network boot or enforcing additional authentication on firmware updates.

Security teams are likely to increase scanning for the CVE‑2026‑97631 identifier in firmware inventories. Future reporting will focus on the release timeline of patches, any observed exploitation attempts, and guidance from industry groups on hardening server boot processes against similar legacy vulnerabilities.