CVE-2026-41516: OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-06 · updated 2026-10-25
Weakness: CWE-208

Description

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`.

Affected products

Linaro/OP-TEE OP-TEE: from 4.5.0 through 4.10.0

References

https://github.com/OP-TEE/optee_os/security/advisories/GHSA-wxp6-8wwr-h4gf

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