CVE-2025-35973: intel-microcode Improper Handling of Values

Vulnerability summary

CVE-2025-35973 is a medium (CVSS 4.5) Improper Handling of Values vulnerability in intel-microcode. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.8% of scored vulnerabilities.

Timeline

1. 11-08-2026
   PublishedVulnerability first disclosed.
2. 12-08-2026
   Last modifiedVulnerability information updated.

Description

Improper handling of values for some Intel(R) Processors within Ring 0: Kernel, Hypervisor and Bare Metal OS may allow an escalation of privilege. Authorized adversary with a privileged user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present with special internal knowledge and require no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (low) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (none) impacts.

• CWE-229Improper Handling of ValuesThe product does not properly handle when the expected number of values for parameters, fields, or arguments is not provided in input, or if those values are undefined.