Bug 2484496 (CVE-2026-45614)

Summary: CVE-2026-45614 optee_os: OP-TEE: Private key reconstruction due to unverified public keys in ECDH
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OP-TEE (Trusted Execution Environment). This vulnerability allows a local attacker to reconstruct the private key by providing approximately 30-40 specially crafted public keys during the Elliptic Curve Diffie-Hellman (ECDH) shared secret generation. The system fails to verify if the provided public keys are valid points on the correct cryptographic curve. Successful exploitation leads to the disclosure of sensitive cryptographic private key information.
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Bug Depends On: 2484504    
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Description OSIDB Bzimport 2026-06-03 19:01:47 UTC 
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.