AMD Ryzen™ 9000HX Series Processors: Improper Handling of Insufficient Entropy in TRNG
CVE-2025-62626 is a high-severity improper handling of insufficient entropy in TRNG vulnerability in AMD Ryzen™ 9000HX Series Processors from AMD, with a CVSS 4.0 base score of 7.2 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.17% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of AMD Ryzen™ 9000HX Series Processors you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| AMD | AMD Ryzen™ 9000HX Series Processors | Not specified in the record | Not stated |
| AMD | AMD EPYC™ 9005 Series Processors | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Attack requirements
- PresentThe target must be in a specific state or configuration for the attack to work.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Confidentiality (vulnerable system)
- HighSerious loss of confidentiality on the vulnerable system.
- Integrity (vulnerable system)
- HighSerious loss of integrity on the vulnerable system.
- Availability (vulnerable system)
- NoneNo loss of availability on the vulnerable system.
- Confidentiality (other systems)
- NoneNo loss of confidentiality on systems beyond the vulnerable one.
- Integrity (other systems)
- NoneNo loss of integrity on systems beyond the vulnerable one.
- Availability (other systems)
- NoneNo loss of availability on systems beyond the vulnerable one.
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. Scored by CNA (amd.com).
Official description
Improper handling of insufficient entropy in the AMD CPUs could allow a local attacker to influence the values returned by the RDSEED instruction, potentially resulting in the consumption of insufficiently random values.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Handling of Insufficient Entropy in TRNG
True random number generators (TRNG) generally have a limited source of entropy and therefore can fail or block.
How developers prevent this class of flaw
- Since the rate at which true random numbers can be generated is limited, it is important that one uses them only when they are needed for security.
- Rather than failing on a lack of random numbers, it is often preferable to wait for more numbers to be created.
More Improper Handling of Insufficient Entropy in TRNG vulnerabilities (CWE-333)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in AMD Ryzen™ 9000HX Series Processors
- 8.6 High severity
- 8.5 High severity
- 7.0 High severity
- 7.5 High severity
- 7.2 High severity
Spotted an error? Tell us.