Vulnerability-Lookup

GHSA-8V5W-2F74-JCCH

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98863"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails\n\nRe-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the\nnested pages fails in the KVM_RUN path.  If userspace re-runs the vCPU, and\nvmcs02 holds valid PFNs from the *previous* run of L2, then KVM could\nre-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page.\n\nNote, both SVM and VMX (as of commit 11722439fb20 (\"KVM: nVMX: Ensure\nKVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit\") ensure the request\nis cleared on VM-Exit (including the \"forced\" case), i.e. there is no risk\nof double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request\ntrying to map the nested pages.",
  "id": "GHSA-8v5w-2f74-jcch",
  "modified": "2026-10-18T18:32:06Z",
  "published": "2026-10-18T18:32:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98863"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98863 (GCVE-0-2026-98863)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-19 09:26

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 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.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6996 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/525694a6021ec6c8f…
https://git.kernel.org/stable/c/942192dbcd3a06695…
https://git.kernel.org/stable/c/10180a27754933902…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 671ddc700fd08b94967b1e2a937020e30c838609 , < 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 (git) Affected: 671ddc700fd08b94967b1e2a937020e30c838609 , < 942192dbcd3a06695ef6b31cf10a41a21cf014d8 (git) Affected: 671ddc700fd08b94967b1e2a937020e30c838609 , < 10180a277549339020b08000206092c07e0bff5a (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/x86.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "525694a6021ec6c8f7ce1f38acdf2dd77698fec1",
              "status": "affected",
              "version": "671ddc700fd08b94967b1e2a937020e30c838609",
              "versionType": "git"
            },
            {
              "lessThan": "942192dbcd3a06695ef6b31cf10a41a21cf014d8",
              "status": "affected",
              "version": "671ddc700fd08b94967b1e2a937020e30c838609",
              "versionType": "git"
            },
            {
              "lessThan": "10180a277549339020b08000206092c07e0bff5a",
              "status": "affected",
              "version": "671ddc700fd08b94967b1e2a937020e30c838609",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/x86.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails\n\nRe-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the\nnested pages fails in the KVM_RUN path.  If userspace re-runs the vCPU, and\nvmcs02 holds valid PFNs from the *previous* run of L2, then KVM could\nre-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page.\n\nNote, both SVM and VMX (as of commit 11722439fb20 (\"KVM: nVMX: Ensure\nKVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit\") ensure the request\nis cleared on VM-Exit (including the \"forced\" case), i.e. there is no risk\nof double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request\ntrying to map the nested pages."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:26:57.709Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a"
        }
      ],
      "title": "KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98863",
    "datePublished": "2026-10-18T15:51:24.446Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-19T09:26:57.709Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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