SLIM-BOOTLOADER · CVE-2026-41221 · Infrastructure
FIX → commit 9e77d9abb867e7ab4fec8249035cf9ba6550aed7 or later ✓ verified
An integer overflow in the UEFI firmware of Intel's Slim Bootloader lets code running at firmware or System Management Mode level escalate privileges on the machine. The sources say an attacker with physical access and low complexity could gain full control of confidentiality, integrity and availability.
first public Nov 10, 2026 · 2 sources
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Embedded and bare-metal devices that boot with Intel Slim Bootloader on the Intel platforms listed in INTEL-SA-01526 (Alder Lake, Apollo Lake, Elkhart Lake, Tiger Lake, Meteor Lake, Panther Lake and others). Exploitation needs physical access and startup-code/SMM-level adversary per Intel. Ordinary PCs with vendor UEFI (not Slim Bootloader) can skip it.
Not affected if no-physical-access, not-slim-bootloader, unknown
Who cares bare-metal, embedded, intel, physical-access, slim-bootloader, uefi-firmware
Integer overflow in the UEFI firmware for the Intel(R) Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of privilege. Startup code and smm adversary with an unauthenticated user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via physical access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.
This page as .md · .json · CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
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Upgrade to commit 9e77d9abb867e7ab4fec8249035cf9ba6550aed7 or later
Update Intel Slim Bootloader to the build at commit hash 9e77d9abb867e7ab4fec8249035cf9ba6550aed7 (from July 7th, 2026) or later; firmware updates come through your board/device vendor.