---
id: CVE-2026-98863
title: >-
  kernel: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails
  (CVE-2026-98863)
summary: >-
  A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine)
  subsystem. When running nested virtual machines, the hypervisor fails to
  properly re-queue a memory page request if retrieving state pages for a nested
  guest fails d…
severity: medium
cvss: 5.6
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-825
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T06:44:56+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98863.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98863.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98863'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555217'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98863'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98863'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98863.mbox
  - 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:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00154
epssPercentile: 0.0452
ingestedAt: '2026-10-18T16:47:32.458Z'
---

## Overview

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem. When running nested virtual machines, the hypervisor fails to properly re-queue a memory page request if retrieving state pages for a nested guest fails during execution. A local user controlling virtual machine processes could exploit this flaw by resuming virtual CPU execution, causing the hypervisor to re-enter the nested guest using stale memory references. This issue primarily leads to a Denial of Service (DoS) through hypervisor memory corruption or system crashes.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98863.json)

**kernel: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 7

## Remediation

Out of support scope