VULNERABILITY INTELLIGENCE
CVE-2026-11835
EPSS probability0.11%
CISA KEVNot currently listed
Published2026-08-04
Last modified2026-10-23
Description
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.
Weakness classification
- b01ddd03-5ef6-483b-b2c5-acba77f1a554: CWE-20