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

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CVE-2026-64286

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
25/07/2026
Last modified:
30/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU<br /> <br /> flush_hyp_vcpu() copies the host vCPU context into the hyp&amp;#39;s private<br /> vCPU on every run. ctxt_to_vcpu() expects a guest context to have a<br /> NULL __hyp_running_vcpu, which is only ever set on the host context, so<br /> that it resolves the vCPU via container_of(). While this is generally<br /> the case, flush_hyp_vcpu() copies the context verbatim and does not<br /> enforce this, so a value provided by the host is dereferenced at EL2<br /> (host -&gt; EL2).<br /> <br /> Fix by clearing __hyp_running_vcpu after the copy.

Impact

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

Base Score: 8.20 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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

Base Score 3.x
8.20
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools