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CVE-2026-63940

kernel: KVM: SEV: Ignore Port I/O requests of length '0'

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · August 5, 2026

Description

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) Secure Encrypted Virtualization (SEV) module. This vulnerability occurs because the system does not properly handle Port I/O requests with a length of zero. An attacker, potentially from a guest virtual machine, could exploit this to cause a system crash or instability, leading to a denial of service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-130 · Improper Handling of Length Parameter Inconsistency