Integer Overflow Vulnerability in Intel Slim Bootloader Firmware

CVE-2026-41221

What is CVE-2026-41221?

The vulnerability in Intel's Slim Bootloader firmware is characterized by an integer overflow issue that may allow for privilege escalation within the UEFI environment. This flaw arises from the interaction of startup code with SMM (System Management Mode) adversaries, permitting an unauthenticated user to exploit the weakness through physical access. The attack method is relatively low in complexity and does not necessitate specific internal knowledge or user interaction. Consequently, this vulnerability presents significant risks to the confidentiality, integrity, and availability of affected systems.

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