Bug 2376426 (CVE-2025-52496)

Summary: CVE-2025-52496 mbedtls: Mbed TLS AESNI Race Condition Vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in mbedtls. A race condition exists during Advanced Encryption Standard New Instructions (AES-NI) detection when specific compiler optimizations are enabled. This flaw allows a local attacker to potentially extract an AES key or perform a GCM forgery within a multithreaded program. This condition arises from concurrent access to shared resources without proper synchronization. Successful exploitation requires the attacker with the ability to influence the timing of threads within the affected application.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2376680, 2376688, 2376679, 2376681, 2376682, 2376683, 2376684, 2376685, 2376686, 2376687, 2376689, 2382564    
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Description OSIDB Bzimport 2025-07-04 15:01:24 UTC 
Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.