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CVE-2026-40290— OP-TEE has a Use-After-Free race in FF-A shared-memory teardown

Quick assessment

Affected
OP-TEE optee_os
Exploitation
Public or AI PoC available; prioritize validation
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 3.16.0版本至4.11.0之前版本存在资源管理错误漏洞，该漏洞源于共享内存拆卸逻辑中存在释放后重用竞争条件，可能导致跨线程释放后重用。

CVSS 7.8 · High EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-TEE optee_os >= 3.16.0, < 4.11.0 affected
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I. Basic Information for CVE-2026-40290

Vulnerability Information
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Vulnerability Title
OP-TEE has a Use-After-Free race in FF-A shared-memory teardown
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 3.16.0 and prior to 4.11.0, a user-after-free (UAF) race condition exists in the shared memory teardown logic of FF-A within OP-TEE SPMC/SP flows. This only applies when OP-TEE is configured as an SPMC for S-EL0 SPs, that is, with `CFG_SECURE_PARTITION=y`. The function `sp_mem_remove()`, responsible for freeing entries in `smem->receivers` and `smem->regions`, fails to acquire the global `sp_mem_lock` before performing the `free()` operations. Concurrently, other code paths, such as `sp_mem_get_receiver()`, iterate over these same lists without holding a lock, or, like `sp_mem_is_shared()`, iterate while holding the lock but are not serialized against the unprotected `free()` in `sp_mem_remove()`. This creates a cross-thread race where a thread iterating the list can acquire a pointer to an entry (e.g., `struct sp_mem_map_region` or `struct sp_mem_receiver`), and then another thread calls `sp_mem_remove()`, freeing the object. When the first thread resumes and dereferences the pointer, it results in a Use-After-Free vulnerability. Version 4.11.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE Trusted OS 资源管理错误漏洞
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 3.16.0版本至4.11.0之前版本存在资源管理错误漏洞，该漏洞源于共享内存拆卸逻辑中存在释放后重用竞争条件，可能导致跨线程释放后重用。
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 >= 3.16.0, < 4.11.0 -

II. Public POCs for CVE-2026-40290

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10419 chars
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III. Intelligence Information for CVE-2026-40290

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Vendor Advisories for CVE-2026-40290 (1)

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

CVE-2026-45614 4.7 MEDIUM OP-TEE vulnerable to ECDH private key recovery
CVE-2026-45702 4.4 MEDIUM OP-TEE has FF-A type confusion in SPMC tmem path that causes S-EL1 kernel panic

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-416

V. Comments for CVE-2026-40290

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