CVE-2026-50720
UnknownSummary
The Ingenic T31 SoC boot ROM flash-boot verification path compares only a single 32-bit word of the RSA signature output against a single 32-bit word of the SHA-256 payload digest, rather than comparing the full data. This allows an attacker with physical write access to boot media to forge modified SPL images that pass secure boot verification without the OEM signing key. Each forgery attempt succeeds with approximately 2/3 probability.
Risk Assessment
The vulnerability allows bypassing secure boot and running unauthorized software on devices with this SoC, potentially leading to full device compromise.
Recommendation
Apply vendor firmware updates if available, or restrict physical access to boot media.
Original NVD description (English source)
The Ingenic T31 SoC boot ROM flash-boot verification path compares only a single 32-bit word of the RSA signature output against a single 32-bit word of the SHA-256 payload digest, rather than compare the full data. This allows an attacker with physical write access to boot media to forge modified SPL (Secondary Program Loader) images that pass secure boot verification without possession of the OEM signing key. Each forgery attempt succeeds with approximately 2/3 probability. This has been validated via reverse engineering, software emulation against vendor-signed images, and end-to-end hardware acceptance of a forged firmware image on a Wyze Video Doorbell v2 (T31X).