Bug 2497716

Summary: CVE-2026-41516 optee_os: OP-TEE: Information disclosure via Bleichenbacher-style padding oracle in RSA PKCS#1 v1.5 decryption [fedora-all]
Product: [Fedora] Fedora Reporter: Keith Grant <kgrant>
Component: optee_osAssignee: Enric Balletbo i Serra <eballetbo>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: 45CC: eballetbo
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["f0de3630-957d-4acf-a8ee-800a42110942"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2497459    

Description Keith Grant 2026-07-07 13:37:51 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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 PKCS#1 v1.5 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 Bleichenbacher-style padding oracle that allows an attacker to recover RSA PKCS#1 v1.5  plaintext. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.
Comment 1 Aoife Moloney 2026-08-17 15:15:31 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.