CVE-2026-41515: OP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery
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 CFGCRYPTODRVRSA=n.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.11.0 - Configuration
Disable the NXP CAAM RSA driver by setting CFG_CRYPTO_DRV_RSA=n as a workaround.
NXP CAAM crypto driver CFG_CRYPTO_DRV_RSA = n
Event History
Frequently Asked Questions
What is the severity of CVE-2026-41515?
CVE-2026-41515 has a severity rating of low, with a score of 3.3.
How do I fix CVE-2026-41515?
To mitigate CVE-2026-41515, upgrade to OP-TEE version 4.11.0 or later.
What is the impact of CVE-2026-41515?
CVE-2026-41515 may allow an attacker to recover plaintext from encrypted messages due to a vulnerability in the RSA-OAEP implementation.
Who is affected by CVE-2026-41515?
Organizations using OP-TEE versions 3.9.0 to 4.10.9 with the NXP CAAM crypto driver are affected by CVE-2026-41515.
What does CVE-2026-41515 exploit?
CVE-2026-41515 exploits a padding oracle in the RSA-OAEP decryption implementation.