{"api_version":"1","generated_at":"2026-10-23T04:27:58+00:00","cve":"CVE-2026-98863","urls":{"html":"https://cve.report/CVE-2026-98863","api":"https://cve.report/api/cve/CVE-2026-98863.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98863","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98863"},"summary":{"title":"KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:40","updated_at":"2026-10-19 10:19:50"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a","name":"https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8","name":"https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1","name":"https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98863","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98863","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 671ddc700fd08b94967b1e2a937020e30c838609 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 671ddc700fd08b94967b1e2a937020e30c838609 942192dbcd3a06695ef6b31cf10a41a21cf014d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 671ddc700fd08b94967b1e2a937020e30c838609 10180a277549339020b08000206092c07e0bff5a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.56 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.10 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.10","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","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"},"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"}],"title":"KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails","x_generator":{"engine":"bippy-1.2.0"}}},"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":"2026-10-19T09:26:57.709Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:40","lastModifiedDate":"2026-10-19 10:19:50","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98863","Ordinal":"1","Title":"KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages f","CVE":"CVE-2026-98863","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98863","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages f"}]}}}