Bug 2497456 (CVE-2026-41514)

Summary: CVE-2026-41514 optee: OP-TEE: Information disclosure via padding oracle in RSA-OAEP decryption
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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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, a Trusted Execution Environment (TEE) designed for Arm Cortex-A cores. The RSA-OAEP decryption implementation in the Hisilicon HPRE crypto driver uses a non-constant-time comparison function, creating a vulnerability known as a padding oracle. This allows a local attacker to potentially recover sensitive information, specifically RSA-OAEP plaintext, by performing a series of adaptive chosen ciphertext queries. This issue primarily affects systems where the Hisilicon HPRE RSA driver is explicitly enabled.
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Bug Depends On: 2497691    
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Description OSIDB Bzimport 2026-07-06 20:02:12 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. Starting in version 4.5.0 and prior to version 4.11.0, the RSA-OAEP decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Manger-style padding oracle that allows an attacker to recover RSA-OAEP plaintext with approximately 1000-2000 adaptive chosen ciphertext queries. Only affects plat-d06 with `CFG_HISILICON_ACC_V3=y`, which seems to be disabled by default. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.