CVE-2025-62626 identifies a vulnerability in the AMD Ryzen™ 9000HX Series processors related to the improper handling of insufficient entropy within the processor's True Random Number Generator (TRNG). The TRNG is critical for generating high-quality random numbers used in cryptographic operations, and the RDSEED instruction provides entropy directly from the hardware RNG to software. Due to improper handling of low entropy conditions, a local attacker with limited privileges can influence or bias the output of RDSEED, causing the system to consume random values that are insufficiently random or predictable. This weakness stems from CWE-333, which concerns improper handling of insufficient entropy sources. The vulnerability does not require user interaction but does require local access with low privileges, making exploitation feasible in multi-user environments or through local malware. The impact is significant because cryptographic keys, nonces, or other security-critical operations relying on RDSEED may be weakened, potentially allowing attackers to compromise confidentiality or integrity of sensitive data. The CVSS 4.0 score of 7.2 reflects high severity, with low attack complexity but requiring partial privileges. No patches or known exploits are currently available, so mitigation relies on limiting local access and monitoring for updates. This vulnerability primarily affects devices using AMD Ryzen 9000HX processors, commonly found in high-performance laptops and mobile workstations.

For European organizations, the vulnerability poses a substantial risk to the security of cryptographic operations on affected AMD Ryzen 9000HX-based systems. Sectors such as finance, government, healthcare, and critical infrastructure that rely on strong cryptographic guarantees could see confidentiality and integrity compromised if attackers exploit this flaw to predict or influence random number generation. This could lead to exposure of sensitive data, unauthorized access, or undermined secure communications. Since the vulnerability requires local access, environments with shared workstations or weak endpoint security controls are at higher risk. The lack of patches increases exposure duration. Additionally, organizations using these processors in remote or hybrid work scenarios may face challenges in controlling local access. The impact on availability is minimal, but the compromise of cryptographic strength can have cascading effects on overall security posture and compliance with European data protection regulations such as GDPR.

1. Restrict local access to systems with AMD Ryzen 9000HX processors by enforcing strict endpoint security policies, including strong authentication and user privilege management. 2. Monitor AMD security advisories closely and apply firmware or microcode updates as soon as patches become available. 3. Where feasible, disable or restrict use of the RDSEED instruction in software or cryptographic libraries until the vulnerability is resolved, or use alternative entropy sources such as OS-level randomness providers (e.g., /dev/random, CryptGenRandom). 4. Employ endpoint detection and response (EDR) tools to detect anomalous local activity that could indicate exploitation attempts. 5. Conduct security awareness training to reduce risk of local compromise through social engineering or malware. 6. For critical systems, consider hardware replacement or use of processors not affected by this vulnerability if patching is delayed. 7. Validate cryptographic implementations to ensure they do not rely solely on RDSEED output and incorporate entropy pool mixing from multiple sources.