CVE-2026-44362— OP-TEE optee_os 授权问题漏洞

OP-TEE's subkey rollback protection can be bypassed with older subkey versions

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

授权机制不恰当

OP-TEE optee_os 授权问题漏洞

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。

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