CVE-2026-45614: CWE-347: Improper Verification of Cryptographic Signature in OP-TEE optee_os
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. Prior to version 4.11.0, on many of the ECDH shared secret paths, the public key isn't verified to be a point on the correct curve. By passing approximately 30-40 crafted public keys to OP-TEE, the private key can be reconstructed by a normal world attacker. When calling TEE_DeriveKey the public key is provided with full X and Y values, but the (X, Y) point might not satisfy the `Y^2 == X^3 + aX + b mod P` math for the specific curve that is used. When those public keys aren't rejected, the attacker can select public keys such that each DeriveKey call will leak `d % r` where `d` is the private key and `r` comes from the relationship between the correct curve and the attacker selected curve. With enough leaked data the Chinese remainder theorem can be used to recover the full private key. Version 4.11.0 fixes the issue.
AI Analysis
Technical Summary
CVE-2026-45614 is an improper verification of cryptographic signature vulnerability (CWE-347) in OP-TEE's optee_os component affecting versions before 4.11.0. The vulnerability arises because the public key used in ECDH key derivation is not checked to ensure it lies on the correct elliptic curve. An attacker can supply approximately 30-40 crafted public keys that do not satisfy the curve equation, causing each TEE_DeriveKey call to leak partial information about the private key (d % r). Using the Chinese remainder theorem on the leaked residues, the attacker can recover the full private key. This compromises the confidentiality of the private key used in the TEE. The vulnerability is fixed in OP-TEE version 4.11.0.
Potential Impact
An attacker with normal world access can reconstruct the private key used in OP-TEE by supplying crafted public keys during ECDH key derivation. This compromises the confidentiality of the private key, potentially undermining the security guarantees of the Trusted Execution Environment. The vulnerability does not affect integrity or availability and requires local access with low privileges and high attack complexity.
Mitigation Recommendations
Upgrade OP-TEE to version 4.11.0 or later, where the vulnerability is fixed by proper verification of the public key on the correct elliptic curve. Patch status is not explicitly stated beyond the fix in 4.11.0, so users should consult the OP-TEE vendor advisory for the latest remediation guidance.
CVE-2026-45614: CWE-347: Improper Verification of Cryptographic Signature in OP-TEE optee_os
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. Prior to version 4.11.0, on many of the ECDH shared secret paths, the public key isn't verified to be a point on the correct curve. By passing approximately 30-40 crafted public keys to OP-TEE, the private key can be reconstructed by a normal world attacker. When calling TEE_DeriveKey the public key is provided with full X and Y values, but the (X, Y) point might not satisfy the `Y^2 == X^3 + aX + b mod P` math for the specific curve that is used. When those public keys aren't rejected, the attacker can select public keys such that each DeriveKey call will leak `d % r` where `d` is the private key and `r` comes from the relationship between the correct curve and the attacker selected curve. With enough leaked data the Chinese remainder theorem can be used to recover the full private key. Version 4.11.0 fixes the issue.
CVSS v3.1
Score 4.7medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-45614 is an improper verification of cryptographic signature vulnerability (CWE-347) in OP-TEE's optee_os component affecting versions before 4.11.0. The vulnerability arises because the public key used in ECDH key derivation is not checked to ensure it lies on the correct elliptic curve. An attacker can supply approximately 30-40 crafted public keys that do not satisfy the curve equation, causing each TEE_DeriveKey call to leak partial information about the private key (d % r). Using the Chinese remainder theorem on the leaked residues, the attacker can recover the full private key. This compromises the confidentiality of the private key used in the TEE. The vulnerability is fixed in OP-TEE version 4.11.0.
Potential Impact
An attacker with normal world access can reconstruct the private key used in OP-TEE by supplying crafted public keys during ECDH key derivation. This compromises the confidentiality of the private key, potentially undermining the security guarantees of the Trusted Execution Environment. The vulnerability does not affect integrity or availability and requires local access with low privileges and high attack complexity.
Mitigation Recommendations
Upgrade OP-TEE to version 4.11.0 or later, where the vulnerability is fixed by proper verification of the public key on the correct elliptic curve. Patch status is not explicitly stated beyond the fix in 4.11.0, so users should consult the OP-TEE vendor advisory for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-12T20:31:43.448Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a207a8be29bf47b50dc5166
Added to database: 06/03/2026, 19:03:39 UTC
Last enriched: 06/10/2026, 19:40:23 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 66
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