CVE-2026-41516

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

State: Published
Severity: 2.5 Low
Published: Jul 6, 2026
Updated: Jul 6, 2026
Reserved: Apr 20, 2026

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`.

Scores

CVSS	Score	Vector	Source
3.1	2.5 Low	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
optee_osOP-TEE	>= 4.5.0, < 4.11.0Affected

References

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

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