CVE-2025-62626 identifies a vulnerability in the AMD Ryzen™ 9000HX Series processors related to the improper handling of insufficient entropy in the processor's True Random Number Generator (TRNG). Specifically, the issue lies in how the processor manages entropy when generating random values via the RDSEED instruction, which is designed to provide high-quality random numbers for cryptographic purposes. Due to this flaw, a local attacker with low privileges can influence the entropy pool, causing the RDSEED instruction to output values that are less random than intended. This insufficient randomness can critically weaken cryptographic operations that depend on secure random number generation, such as key generation, nonces, and cryptographic protocols. The vulnerability is classified under CWE-333, which pertains to improper handling of insufficient entropy. The CVSS 4.0 vector indicates that exploitation requires local access (AV:L), low attack complexity (AC:L), partial attacker's privileges (PR:L), no user interaction (UI:N), and results in high confidentiality and integrity impact (VC:H, VI:H) but no availability impact. No known exploits are currently reported in the wild, and AMD has not yet published patches, though firmware or microcode updates are expected. The vulnerability affects systems using AMD Ryzen 9000HX processors, commonly found in high-performance laptops and mobile workstations. This flaw undermines the trustworthiness of the processor's hardware random number generation, a foundational element for secure computing.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of cryptographic operations that rely on hardware-generated random numbers. Sectors such as finance, government, healthcare, and critical infrastructure that use AMD Ryzen 9000HX-based devices for secure communications, encryption, or digital signatures may experience weakened security guarantees. The compromised entropy can lead to predictable cryptographic keys or session tokens, facilitating attacks such as key recovery, impersonation, or data decryption. Since the vulnerability requires local access with low privileges, insider threats or attackers who gain limited access to endpoints could exploit it to escalate their capabilities or undermine security controls. The lack of user interaction needed for exploitation increases the risk of stealthy attacks. Although no active exploits are known, the potential impact on large-scale deployments in Europe is considerable, especially given the widespread use of AMD processors in enterprise laptops and mobile devices. This could affect data protection compliance and increase the risk of breaches involving sensitive personal or corporate data.

Organizations should proactively monitor AMD’s security advisories and apply firmware or microcode updates as soon as they become available to address this vulnerability. In the interim, restrict local access to systems with AMD Ryzen 9000HX processors by enforcing strict physical security controls and limiting user privileges to the minimum necessary. Employ endpoint detection and response (EDR) solutions to monitor for suspicious local activity that could indicate attempts to manipulate entropy sources. Where possible, supplement hardware random number generation with software-based entropy sources or cryptographic libraries that incorporate multiple entropy inputs to reduce reliance on the vulnerable TRNG. Conduct regular security audits and penetration tests focusing on local privilege escalation and cryptographic key management. Educate users and administrators about the risks of local exploitation and enforce policies to prevent unauthorized access. For critical systems, consider hardware diversity or temporary use of alternative processors until patches are applied. Finally, ensure cryptographic keys are rotated regularly to limit exposure from potentially compromised random number generation.