---
id: CVE-2026-98863
title: 'KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails

  Re-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the
  nested pages fails in th…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 <
    525694a6021ec6c8f7ce1f38acdf2dd77698fec1
  - >-
    Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 <
    942192dbcd3a06695ef6b31cf10a41a21cf014d8
  - >-
    Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 <
    10180a277549339020b08000206092c07e0bff5a
  - Linux 5.4
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:51:24.446Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98863'
references:
  - url: 'https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1'
  - url: 'https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8'
  - url: 'https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.458Z'
---

## Overview

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

KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails

Re-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the
nested pages fails in the KVM_RUN path.  If userspace re-runs the vCPU, and
vmcs02 holds valid PFNs from the *previous* run of L2, then KVM could
re-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page.

Note, both SVM and VMX (as of commit 11722439fb20 ("KVM: nVMX: Ensure
KVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit") ensure the request
is cleared on VM-Exit (including the "forced" case), i.e. there is no risk
of double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request
trying to map the nested pages.

## Affected

- `Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 525694a6021ec6c8f7ce1f38acdf2dd77698fec1`
- `Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 942192dbcd3a06695ef6b31cf10a41a21cf014d8`
- `Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 10180a277549339020b08000206092c07e0bff5a`
- `Linux 5.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.