CVE-2026-41516
LowCVSS 2.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
The RSA PKCS#1 v1.5 implementation in the Hisilicon HPRE crypto driver in OP-TEE is vulnerable to a Bleichenbacher-style attack. Non-constant-time `memcmp()` and distinguishable error paths allow an attacker to recover plaintext.
Risk Assessment
An attacker can exploit the padding oracle to decrypt RSA PKCS#1 v1.5 ciphertexts, potentially exposing sensitive data or compromising communication confidentiality.
Recommendation
Upgrade OP-TEE to version 4.11.0 or later. As a workaround, disable the Hisilicon HPRE RSA driver by setting `CFG_HISILICON_ACC_V3=n`.
Original NVD description (English source)
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 4.5.0 and prior to version 4.11.0, the RSA PKCS#1 v1.5 decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Bleichenbacher-style padding oracle that allows an attacker to recover RSA PKCS#1 v1.5 plaintext. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.