Low severity · published Jul 6, 2026
CVE-2026-41516
OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
3.3
CVSS
0.1%
EPSS
No
On KEV
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`.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
optee_os · OP-TEE
>= 4.5.0, < 4.11.0 · source: vendor
OP
Op-tee · Trustedfirmware
4.5.0 through 4.10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41516
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41516
Mitigation
https://github.com/OP-TEE/optee_os/security/advisories/GHSA-wxp6-8wwr-h4gf
More from optee_os
8.7
CVE-2026-33317
OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure
7.8
CVE-2026-40290
OP-TEE has a Use-After-Free race in FF-A shared-memory teardown
7.5
CVE-2026-33662
OP-TEE: RSASSA EMSA- PKCS1-v1_5 underflow in emsa_pkcs1_v1_5_encode()
6.7
CVE-2026-71969
OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations
6.7
CVE-2026-71968
OP-TEE OS 4.10.0 Use-After-Free via Trusted Application Loader TA_FLAG_CONCURRENT