CVE-2026-46131

kernel: KVM: x86: check for nEPT/nNPT in slow flush hypercalls

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 28, 2026

Updated · July 3, 2026

Description

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) x86 virtualization module. An incorrect check for nested EPT/NPT (Nested Extended Page Tables/Nested Nested Page Tables) in slow flush hypercalls could lead to improper handling of L2 guests. This vulnerability arises because the is_guest_mode(vcpu) check was not sufficient, potentially allowing an L2 guest with nested EPT/NPT enabled to bypass intended security restrictions.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-266 · Incorrect Privilege Assignment