{"api_version":"1","generated_at":"2026-05-30T20:15:36+00:00","cve":"CVE-2026-46076","urls":{"html":"https://cve.report/CVE-2026-46076","api":"https://cve.report/api/cve/CVE-2026-46076.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46076","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46076"},"summary":{"title":"KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1\n\nExplicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want\nto intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the\nhypercall is something other than one of the supported Hyper-V hypercalls.\nWhen all of the above conditions are met, KVM will intercept VMMCALL but\nnever forward it to L1, i.e. will let L2 make hypercalls as if it were L1.\n\nThe TLFS says a whole lot of nothing about this scenario, so go with the\narchitectural behavior, which says that VMMCALL #UDs if it's not\nintercepted.\n\nOpportunistically do a 2-for-1 stub trade by stub-ifying the new API\ninstead of the helpers it uses.  The last remaining \"single\" stub will\nsoon be dropped as well.\n\n[sean: rewrite changelog and comment, tag for stable, remove defunct stubs]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:28","updated_at":"2026-05-30 11:17:20"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.9","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","baseScore":7.9,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.9","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","data":{"baseScore":7.9,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/924d721fae95687acedbaf624a094ed0e8b67104","name":"https://git.kernel.org/stable/c/924d721fae95687acedbaf624a094ed0e8b67104","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5fb4a5f361565f5b629d8a8fe5288ce8463c5727","name":"https://git.kernel.org/stable/c/5fb4a5f361565f5b629d8a8fe5288ce8463c5727","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/009c0f726abeaa67aad1d96b883bdce01d405ce2","name":"https://git.kernel.org/stable/c/009c0f726abeaa67aad1d96b883bdce01d405ce2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c36991c6f8d2ab56ee67aff04e3c357f45cfc76c","name":"https://git.kernel.org/stable/c/c36991c6f8d2ab56ee67aff04e3c357f45cfc76c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46076","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46076","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 924d721fae95687acedbaf624a094ed0e8b67104 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 009c0f726abeaa67aad1d96b883bdce01d405ce2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 5fb4a5f361565f5b629d8a8fe5288ce8463c5727 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 c36991c6f8d2ab56ee67aff04e3c357f45cfc76c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.86 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.27 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.4 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46076","cve":"CVE-2026-46076","epss":"0.000180000","percentile":"0.049190000","score_date":"2026-05-29","updated_at":"2026-05-30 00:13:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kvm/hyperv.h","arch/x86/kvm/svm/hyperv.h","arch/x86/kvm/svm/nested.c","arch/x86/kvm/svm/svm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"924d721fae95687acedbaf624a094ed0e8b67104","status":"affected","version":"3f4a812edf5cb0a50e65fbdfafdb3e688da18f16","versionType":"git"},{"lessThan":"009c0f726abeaa67aad1d96b883bdce01d405ce2","status":"affected","version":"3f4a812edf5cb0a50e65fbdfafdb3e688da18f16","versionType":"git"},{"lessThan":"5fb4a5f361565f5b629d8a8fe5288ce8463c5727","status":"affected","version":"3f4a812edf5cb0a50e65fbdfafdb3e688da18f16","versionType":"git"},{"lessThan":"c36991c6f8d2ab56ee67aff04e3c357f45cfc76c","status":"affected","version":"3f4a812edf5cb0a50e65fbdfafdb3e688da18f16","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/hyperv.h","arch/x86/kvm/svm/hyperv.h","arch/x86/kvm/svm/nested.c","arch/x86/kvm/svm/svm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.2"},{"lessThan":"6.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.86","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.27","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.86","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.27","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"6.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1\n\nExplicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want\nto intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the\nhypercall is something other than one of the supported Hyper-V hypercalls.\nWhen all of the above conditions are met, KVM will intercept VMMCALL but\nnever forward it to L1, i.e. will let L2 make hypercalls as if it were L1.\n\nThe TLFS says a whole lot of nothing about this scenario, so go with the\narchitectural behavior, which says that VMMCALL #UDs if it's not\nintercepted.\n\nOpportunistically do a 2-for-1 stub trade by stub-ifying the new API\ninstead of the helpers it uses.  The last remaining \"single\" stub will\nsoon be dropped as well.\n\n[sean: rewrite changelog and comment, tag for stable, remove defunct stubs]"}],"metrics":[{"cvssV3_1":{"baseScore":7.9,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-30T10:47:16.875Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/924d721fae95687acedbaf624a094ed0e8b67104"},{"url":"https://git.kernel.org/stable/c/009c0f726abeaa67aad1d96b883bdce01d405ce2"},{"url":"https://git.kernel.org/stable/c/5fb4a5f361565f5b629d8a8fe5288ce8463c5727"},{"url":"https://git.kernel.org/stable/c/c36991c6f8d2ab56ee67aff04e3c357f45cfc76c"}],"title":"KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46076","datePublished":"2026-05-27T12:58:09.169Z","dateReserved":"2026-05-13T15:03:33.096Z","dateUpdated":"2026-05-30T10:47:16.875Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:28","lastModifiedDate":"2026-05-30 11:17:20","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","baseScore":7.9,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"HIGH"},"exploitabilityScore":2,"impactScore":5.3}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46076","Ordinal":"1","Title":"KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L","CVE":"CVE-2026-46076","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46076","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1\n\nExplicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want\nto intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the\nhypercall is something other than one of the supported Hyper-V hypercalls.\nWhen all of the above conditions are met, KVM will intercept VMMCALL but\nnever forward it to L1, i.e. will let L2 make hypercalls as if it were L1.\n\nThe TLFS says a whole lot of nothing about this scenario, so go with the\narchitectural behavior, which says that VMMCALL #UDs if it's not\nintercepted.\n\nOpportunistically do a 2-for-1 stub trade by stub-ifying the new API\ninstead of the helpers it uses.  The last remaining \"single\" stub will\nsoon be dropped as well.\n\n[sean: rewrite changelog and comment, tag for stable, remove defunct stubs]","Type":"Description","Title":"KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L"}]}}}