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

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-18 15:51
VLAI
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 7100 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 671ddc700fd08b94967b1e2a937020e30c838609 , < 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 (git)
Affected: 671ddc700fd08b94967b1e2a937020e30c838609 , < 942192dbcd3a06695ef6b31cf10a41a21cf014d8 (git)
Affected: 671ddc700fd08b94967b1e2a937020e30c838609 , < 10180a277549339020b08000206092c07e0bff5a (git)
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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-rc5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/x86.c"
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          "vendor": "Linux",
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              "versionType": "semver"
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            }
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              "negate": false,
              "operator": "OR"
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      ],
      "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": "2026-10-18T15:51:24.446Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1"
        },
        {
          "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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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98863",
    "datePublished": "2026-10-18T15:51:24.446Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-18T15:51:24.446Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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                "programFiles": [
                  "arch/x86/kvm/x86.c"
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                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-98863",
        "lastModified": "2026-10-18T16:17:40.780",
        "metrics": {},
        "published": "2026-10-18T16:17:40.780",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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