{"api_version":"1","generated_at":"2026-10-23T16:15:34+00:00","cve":"CVE-2026-98720","urls":{"html":"https://cve.report/CVE-2026-98720","api":"https://cve.report/api/cve/CVE-2026-98720.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98720","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98720"},"summary":{"title":"KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified\n\nForce a refresh of the vmcs02 MSR bitmap during nested VM-Enter if the\nruntime eVMCS controls (pin, primary, secondary, etc.) are being updated.\nIf L1 isn't intercepting TPR writes, runs L2 with TPR virtualization, and\nthen runs the same L2 with TPR virtualization disabled, KVM will fail to\nrefresh msr_bitmap02 and leave TPR in passthrough mode even though TPR\nvirtualization is disabled.  I.e. failure to refresh the bitmap lets L2 (or\nL1 by proxy) read and write L0's TPR.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:25","updated_at":"2026-10-19 10:19:36"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2abb25273c82061dd4670690c81c319c03740bf6","name":"https://git.kernel.org/stable/c/2abb25273c82061dd4670690c81c319c03740bf6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a","name":"https://git.kernel.org/stable/c/f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1e497e3bdab6983deb68a1d26b488027deb4527f","name":"https://git.kernel.org/stable/c/1e497e3bdab6983deb68a1d26b488027deb4527f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2db11598b59f16ddb6420693f9a4ac4efc3d4789","name":"https://git.kernel.org/stable/c/2db11598b59f16ddb6420693f9a4ac4efc3d4789","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98720","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98720","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e 2db11598b59f16ddb6420693f9a4ac4efc3d4789 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e 1e497e3bdab6983deb68a1d26b488027deb4527f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e 2abb25273c82061dd4670690c81c319c03740bf6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* 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/vmx/nested.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2db11598b59f16ddb6420693f9a4ac4efc3d4789","status":"affected","version":"502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e","versionType":"git"},{"lessThan":"f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a","status":"affected","version":"502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e","versionType":"git"},{"lessThan":"1e497e3bdab6983deb68a1d26b488027deb4527f","status":"affected","version":"502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e","versionType":"git"},{"lessThan":"2abb25273c82061dd4670690c81c319c03740bf6","status":"affected","version":"502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/vmx/nested.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.17"},{"lessThan":"5.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","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":"6.12.113","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.56","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.10","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"5.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified\n\nForce a refresh of the vmcs02 MSR bitmap during nested VM-Enter if the\nruntime eVMCS controls (pin, primary, secondary, etc.) are being updated.\nIf L1 isn't intercepting TPR writes, runs L2 with TPR virtualization, and\nthen runs the same L2 with TPR virtualization disabled, KVM will fail to\nrefresh msr_bitmap02 and leave TPR in passthrough mode even though TPR\nvirtualization is disabled.  I.e. failure to refresh the bitmap lets L2 (or\nL1 by proxy) read and write L0's TPR."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:24:31.090Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2db11598b59f16ddb6420693f9a4ac4efc3d4789"},{"url":"https://git.kernel.org/stable/c/f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a"},{"url":"https://git.kernel.org/stable/c/1e497e3bdab6983deb68a1d26b488027deb4527f"},{"url":"https://git.kernel.org/stable/c/2abb25273c82061dd4670690c81c319c03740bf6"}],"title":"KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98720","datePublished":"2026-10-18T15:46:55.863Z","dateReserved":"2026-09-25T10:25:14.366Z","dateUpdated":"2026-10-19T09:24:31.090Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:25","lastModifiedDate":"2026-10-19 10:19:36","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98720","Ordinal":"1","Title":"KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls ar","CVE":"CVE-2026-98720","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98720","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified\n\nForce a refresh of the vmcs02 MSR bitmap during nested VM-Enter if the\nruntime eVMCS controls (pin, primary, secondary, etc.) are being updated.\nIf L1 isn't intercepting TPR writes, runs L2 with TPR virtualization, and\nthen runs the same L2 with TPR virtualization disabled, KVM will fail to\nrefresh msr_bitmap02 and leave TPR in passthrough mode even though TPR\nvirtualization is disabled.  I.e. failure to refresh the bitmap lets L2 (or\nL1 by proxy) read and write L0's TPR.","Type":"Description","Title":"KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls ar"}]}}}