Bug 2453969 (CVE-2025-66442)

Summary: CVE-2025-66442 mbedtls: Mbed TLS and TF-PSA-Crypto: Information disclosure via compiler-induced timing side channel
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Mbed TLS and TF-PSA-Crypto. This vulnerability is a compiler-induced timing side channel that occurs when the LLVM compiler's select-optimize feature is enabled. A remote attacker could potentially exploit this timing difference during RSA and CBC/ECB decryption operations to infer sensitive information, such as cryptographic keys.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2454197, 2454199, 2454202, 2454206, 2454211    
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Description OSIDB Bzimport 2026-04-01 20:02:19 UTC 
In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.