CVE-2026-63940: KVM: SEV: Ignore Port I/O requests of length '0'

Overview

Severity

High (CVSS 7.7)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-07-21

Last Updated

2026-08-13

EPSS Score

0.18% (percentile: 8.1%)

Affected Products (2)

Other

• 21580-17084
• 21684-17084

Revision History

• 2026-07-21: Information published.
• 2026-08-13: Information published.