CVE-2026-41515
LowCVSS 2.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
The RSA-OAEP decryption in the NXP CAAM crypto driver for OP-TEE (versions 3.9.0 to 4.10.0) uses non-constant-time `memcmp()` for label hash verification and has distinguishable error paths. This allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries via a Manger-style padding oracle.
Risk Assessment
An attacker can decrypt data protected by RSA-OAEP within the TEE, leading to leakage of sensitive information processed in the secure enclave, such as keys or credentials.
Recommendation
Upgrade OP-TEE to version 4.11.0 or later immediately. If upgrading is not possible, temporarily disable the NXP CAAM RSA driver by setting `CFG_CRYPTO_DRV_RSA=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 3.9.0 and prior to version 4.11.0, the RSA-OAEP decryption implementation in the NXP CAAM crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Manger-style padding oracle that allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries. Version 4.11.0 contains a patch. As a workaround, disable the NXP CAAM RSA driver with `CFG_CRYPTO_DRV_RSA=n`.