CVE-2026-41516CWE-208

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

Low · published July 6, 2026

CVSS v3.1
2.5
EPSS
0%
Percentile
2.9
In the wild
Unconfirmed
What it is

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`.

The record
Technical detail
CVSS v3.1
2.5 · LOW
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00138 · 2.9th percentile
Weakness
CWE-208 · Observable Timing Discrepancy
Published
2026-07-06T19:27Z
EPSS history
Timeline
  • 06 JUL 19:27Z
    OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
    cvelistv5