CVE-2026-41516: OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
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 CFGHISILICONACCV3=n.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
OP-TEE Hisilicon HPRE crypto driverto a version that resolves this vulnerability.Fixed in 4.11.0 - Configuration
As a workaround, disable the Hisilicon HPRE RSA driver by setting `CFG_HISILICON_ACC_V3=n`.
Hisilicon HPRE RSA driver CFG_HISILICON_ACC_V3 = n
Event History
Frequently Asked Questions
What is the severity of CVE-2026-41516?
The severity of CVE-2026-41516 is low with a score of 3.3.
How do I fix CVE-2026-41516?
To fix CVE-2026-41516, upgrade OP-TEE from version 4.5.0 to a version that is 4.11.0 or later.
What type of vulnerability is CVE-2026-41516?
CVE-2026-41516 is a padding oracle vulnerability affecting the RSA PKCS#1 v1.5 decryption implementation.
Who is affected by CVE-2026-41516?
Users of OP-TEE versions from 4.5.0 to prior to 4.11.0, particularly those using Hisilicon HPRE crypto driver, are affected by CVE-2026-41516.
What systems utilize the OP-TEE vulnerable to CVE-2026-41516?
OP-TEE is designed to work on Arm Cortex-A core systems as a Trusted Execution Environment alongside non-secure Linux kernels.