Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-64562

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
04/08/2026
Last modified:
08/08/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> KVM: nVMX: Hide shadow VMCS right after VMCLEAR<br /> <br /> free_nested() frees the shadow VMCS while vmcs01 still points to it. But<br /> because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU<br /> might migrate before the pointer is cleared and __loaded_vmcs_clear()<br /> may then execute VMCLEAR.<br /> <br /> The VMCS needs to stay attached until its explicit VMCLEAR completes, but<br /> then it can be hidden and the page safely freed.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.80
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools