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CVE-2026-45702— OP-TEE has FF-A type confusion in SPMC tmem path that causes S-EL1 kernel panic

Quick assessment

Affected
OP-TEE optee_os
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OP-TEE Trusted OS是OP-TEE开源的一个实现 Arm TrustZone 技术的开源可信执行环境（TEE）。 OP-TEE Trusted OS 4.3.0版本至4.11.0之前版本存在安全漏洞，该漏洞源于处理FFA_MEM_SHARE请求时存在类型混淆漏洞。

CVSS 4.4 · Medium EPSS 0.17% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-TEE optee_os >= 4.3.0, < 4.11.0 affected
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I. Basic Information for CVE-2026-45702

Vulnerability Information
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Vulnerability Title
OP-TEE has FF-A type confusion in SPMC tmem path that causes S-EL1 kernel panic
Source: CVE Program / CVE List V5
Vulnerability 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 4.3.0 and prior to version 4.11.0, a type confusion vulnerability exists in OP-TEE OS when processing an FFA_MEM_SHARE request from the normal world. This only applies when OP-TEE is configured as an SPMC for S-EL0 SPs, that is, with `CFG_CORE_SEL1_SPMC=y` and `CFG_SECURE_PARTITION=y`. Version 4.11.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE Trusted OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OP-TEE Trusted OS是OP-TEE开源的一个实现 Arm TrustZone 技术的开源可信执行环境（TEE）。 OP-TEE Trusted OS 4.3.0版本至4.11.0之前版本存在安全漏洞，该漏洞源于处理FFA_MEM_SHARE请求时存在类型混淆漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OP-TEE optee_os >= 4.3.0, < 4.11.0 -

II. Public POCs for CVE-2026-45702

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III. Intelligence Information for CVE-2026-45702

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Vendor Advisories for CVE-2026-45702 (1)

Same Patch Batch · OP-TEE · 2026-06-03 · 3 CVEs total

CVE-2026-40290 7.8 HIGH OP-TEE has a Use-After-Free race in FF-A shared-memory teardown
CVE-2026-45614 4.7 MEDIUM OP-TEE vulnerable to ECDH private key recovery

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-843

V. Comments for CVE-2026-45702

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