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CVE Watch4 ago 2026

CVE-2026-11835

Time-of-check time-of-use (TOCTOU) vulnerability combined with missing input validation in Caliptra Core ROM (UpdateResetFlow::run()) in sub

CVSS

Sin CVSS

EPSS

0.1%

p1

KEV

Exploit Today

0

0-100

Publicado: 4 ago 2026 · Última mod.: 4 ago 2026 · CWE-20 · CWE-367

EPSS · 30d
0.1%EPSS · 30 días0.1%
2026-08-042026-08-30
Descripción técnica

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. This issue affects Core ROM: 2.1.0 through 2.1.1.

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