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CVE-2026-71967— OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

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组织的一款可信执行环境操作系统。 OP-TEE Trusted OS 4.10.0及之前版本存在异常处理不当漏洞，该漏洞源于Widevine伪TA的open_session处理器存在空指针取消引用问题，可能导致启用CFG_WIDEVINE_PTA时普通世界客户端引发拒绝服务。

CVSS 5.5 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
OP-TEE optee_os ≤ 4.10.0 affected
0aadfc23407f50e770eb5ddd871fc208f5626833 unaffected
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I. Basic Information for CVE-2026-71967

Vulnerability Information
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Vulnerability Title
OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session
Source: CVE Program / CVE List V5
Vulnerability Description
OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA open_session handler that allows Normal World clients to cause a denial of service when CFG_WIDEVINE_PTA is enabled. Attackers can open a session directly on the Widevine PTA to trigger an unconditional dereference of a NULL calling session pointer via is_user_ta_ctx(), faulting the TEE at S-EL1 and crashing the trusted execution environment.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE Trusted OS 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OP-TEE Trusted OS是OP-TEE组织的一款可信执行环境操作系统。 OP-TEE Trusted OS 4.10.0及之前版本存在异常处理不当漏洞，该漏洞源于Widevine伪TA的open_session处理器存在空指针取消引用问题，可能导致启用CFG_WIDEVINE_PTA时普通世界客户端引发拒绝服务。
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 0 ~ 4.10.0 -

II. Public POCs for CVE-2026-71967

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III. Intelligence Information for CVE-2026-71967

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Patches & Fixes for CVE-2026-71967 (2)

Other References for CVE-2026-71967 (1)

Same Patch Batch · OP-TEE · 2026-08-10 · 3 CVEs total

CVE-2026-71968 6.7 MEDIUM OP-TEE OS 4.10.0 Use-After-Free via Trusted Application Loader TA_FLAG_CONCURRENT
CVE-2026-71969 6.7 MEDIUM OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-476

V. Comments for CVE-2026-71967

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