Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-11835

Gravedad CVSS v4.0:
MEDIA
Tipo:
CWE-20 Validación incorrecta de entrada
Fecha de publicación:
04/08/2026
Última modificación:
04/08/2026

Descripción

*** Pendiente de traducción *** Time-of-check time-of-use (TOCTOU) vulnerability combined with missing input validation in Caliptra Core ROM (UpdateResetFlow::run()) in subsystem mode allows a compromised local attacker to silently bypass secure boot by supplying an AXI staging address that is not validated against the strap-configured SS_EXTERNAL_STAGING_AREA_BASE_ADDR, enabling firmware to be modified between verification and loading into ICCM. Attestation continues to report the originally verified image digest, masking the compromise. Exploitation requires a compromised MCU firmware with AXI manager access to unprotected SRAM reachable by Caliptra.<br /> <br /> This issue affects Core ROM: 2.1.0 through 2.1.1.