CVE-2026-20917: intel-microcode

Vulnerability summary

CVE-2026-20917 is a medium (CVSS 4.0) vulnerability in intel-microcode. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.2% of scored vulnerabilities.

Timeline

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

Description

Exposure of sensitive information caused by incorrect data forwarding during transient execution for some Intel(R) Processors within Ring 0: Hypervisor and Kernel may allow information disclosure. System software adversary with a privileged user combined with a high complexity attack may enable data exposure. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (none) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (none) and availability (none) impacts.

• CWE-1422Exposure of Sensitive Information caused by Incorrect Data Forwarding during Transient ExecutionA processor event or prediction may allow incorrect or stale data to be forwarded to transient operations, potentially exposing data over a covert channel.