EUVD-2026-41911Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Local access with low privilege needed to reach the TA loader; integrity-only impact (rollback bypass); scope unchanged as compromise stays within the TEE loading subsystem.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Subkey rollback protection in OP-TEE OS versions 3.20.0 through 4.10.x is completely non-functional due to a missing field assignment in the Trusted Application loading pipeline, allowing revoked or downgraded subkeys to authenticate TAs without detection. A locally authenticated attacker who can supply TA binaries to the REE filesystem loader can bypass the entire key-chain revocation model, loading previously invalidated trusted code into the TrustZone secure world. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local authenticated access (PR:L per CVSS vector) with the ability to present a TA binary to the REE filesystem TA loader (`ree_fs_ta_open()`). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N accurately reflects real-world risk: exploitation requires local authenticated access with no network-facing attack surface and no confidentiality or availability impact, yielding a base score of 5.5. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A locally authenticated attacker on an OP-TEE-enabled device running versions 3.20.0-4.10.x obtains or crafts a TA binary signed with a previously revoked or older-version subkey - for instance, a key deliberately revoked after a prior TA compromise. The attacker submits this TA through the normal `ree_fs_ta_open()` loading path; because `shdr_load_pub_key()` silently drops `subkey_version` and `key->version` stays zero, `check_update_version()` passes the rollback check unconditionally, and the TEE loads the unauthorized TA into the TrustZone secure world. … |
| Remediation | Upgrade to OP-TEE OS version 4.11.0, which contains the vendor-confirmed patch correcting `shdr_load_pub_key()` to properly assign `subkey_version` to the runtime `shdr_pub_key` structure before `check_update_version()` is invoked. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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