---
id: CVE-2026-46032
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT

  If loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit()
  returns an error code that is ig…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT

  If loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit()
  returns an error code that is ig…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.9, < 7.0.4'
patched:
  - linux_kernel 7.0.4
published: '2026-05-27'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:31.810'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46032'
references:
  - url: 'https://git.kernel.org/stable/c/5d291ef0585ed880ed4dd71ea1a5965e0a65fb53'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9a738cf170a4a2332ea3a15e23ec65b5757fe4a1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0eb0a8959ac2b808eb11548d002fe1f9b5650cc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00155
epssPercentile: 0.04141
ingestedAt: '2026-10-15T11:00:41.704Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT

If loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit()
returns an error code that is ignored by most callers, and continues to
run L1 with corrupted state. A sane recovery is not possible in this
case, and HW behavior is to cause a shutdown. Inject a triple fault
instead, and do not return early from nested_svm_vmexit(). Continue
cleaning up the vCPU state (e.g. clear pending exceptions), to handle
the failure as gracefully as possible.

From the APM:

  Upon #VMEXIT, the processor performs the following actions in order to
  return to the host execution context:

  ...

  if (illegal host state loaded, or exception while loading host state)
      shutdown
  else
      execute first host instruction following the VMRUN

Remove the return value of nested_svm_vmexit(), which is mostly
unchecked anyway.

## Affected

- `linux_kernel >= 5.9, < 7.0.4`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.4`