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CVE-2026-41516

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

Published: Jul 6, 2026Updated: Jul 7, 2026 Sources: CVE List NVDCWE-208
2.5LOW
NVD MITRE
EPSS Score
0.1%
Top 96.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

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`.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-208

Affected Products

OP-TEE
oss-projectaka optee, op-tee os
optee_osEmbedded
Operating Systems / rtos-embedded-os
trustedfirmware
commercialaka mbed tls, op-tee, trusted firmware-a
op-teeOn-prem
Security Products / pki-crypto

Exploitability

Workaround Available

References

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

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