CVE-2026-41516

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`.

• CWE-208

• https://github.com/OP-TEE/optee_os/security/advisories/GHSA-wxp6-8wwr-h4gfMitigation, Vendor Advisory, Exploit, Patch

Published

Jul 6, 2026

Last Modified

Jul 7, 2026

Status

Analyzed

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