Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-44362— OP-TEE's subkey rollback protection can be bypassed with older subkey versions

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 optee_os是OP-TEE的安全操作系统。 OP-TEE optee_os 3.20.0版本至4.11.0之前版本存在授权问题漏洞，该漏洞源于系统在Trusted Application (TA)加载过程中未能传播子密钥版本数据，导致子密钥回滚保护失效，可能允许使用已撤销或旧版本的子密钥。

CVSS 5.5 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-TEE optee_os >= 3.20.0, < 4.11.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-44362

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OP-TEE's subkey rollback protection can be bypassed with older subkey versions
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 3.20.0 and prior to version 4.11.0, a vulnerability in OP-TEE’s subkey rollback protection allows the use of revoked or older subkey versions because the system fails to propagate versioning data during the Trusted Application (TA) loading process. In `core/crypto/signed_hdr.c`, the function `shdr_load_pub_key()` parses subkey headers but does not assign the `subkey_version` to the runtime `shdr_pub_key` structure. As a result, the `key->version` field remains at zero regardless of the version specified in the header. When `ree_fs_ta_open()` in `core/kernel/ree_fs_ta.c` calls `check_update_version()`, it passes this zeroed version to the rollback database. Because the database never receives a non-zero version to record, it never advances, effectively bypassing the rollback check and allowing TAs signed with downgraded subkey chains to load successfully. This impacts OP-TEE mainline configurations that utilize subkey-based signing chains for Trusted Application (TA) authentication. Version 4.11.0 contains a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE optee_os 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OP-TEE optee_os是OP-TEE的安全操作系统。 OP-TEE optee_os 3.20.0版本至4.11.0之前版本存在授权问题漏洞，该漏洞源于系统在Trusted Application (TA)加载过程中未能传播子密钥版本数据，导致子密钥回滚保护失效，可能允许使用已撤销或旧版本的子密钥。
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 >= 3.20.0, < 4.11.0 -

II. Public POCs for CVE-2026-44362

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-44362

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-44362 (1)

Same Patch Batch · OP-TEE · 2026-07-06 · 8 CVEs total

CVE-2026-40257 5.5 MEDIUM OP-TEE has SHA-3 accelerated finalize heap overflow
CVE-2026-42546 3.8 LOW OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references
CVE-2026-41434 3.3 LOW OP-TEE has unbounded recursion in sanitize_client_object()
CVE-2026-41514 2.5 LOW OP-TEE: RSA-OAEP padding oracle in Hisilicon HPRE driver enables plaintext recovery
CVE-2026-41516 2.5 LOW OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
CVE-2026-41515 2.5 LOW OP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery
CVE-2026-53763 OP-TEE has AES-GCM 32-bit integer overflow in length counters that breaks authentication g

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-285

V. Comments for CVE-2026-44362

No comments yet

Leave a comment