{"api_version":"1","generated_at":"2026-07-20T14:42:31+00:00","cve":"CVE-2026-64172","urls":{"html":"https://cve.report/CVE-2026-64172","api":"https://cve.report/api/cve/CVE-2026-64172.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64172","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64172"},"summary":{"title":"KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)\n\nHygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and\nshare the same erratum #1235: hardware may read a stale IsRunning=1 bit\nduring ICR write emulation and silently fail to generate an\nAVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU.\n\nThe absence of the VM-Exit causes KVM to miss the required wakeup of\nblocking target vCPUs, leading to hung vCPUs and unbounded delays in\nguest execution.\n\nExtend the existing AMD Family 17h erratum #1235 workaround to also cover\nHygon Family 18h.  With IPI virtualization disabled, KVM never sets\nIsRunning=1 in the Physical ID table, so every non-self IPI generates a\nVM-Exit and is correctly emulated.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:59","updated_at":"2026-07-19 16:17:59"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/94ade38f317ea086a181db0e6b69c574b3b70a5e","name":"https://git.kernel.org/stable/c/94ade38f317ea086a181db0e6b69c574b3b70a5e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9a12fa5213cfc391e0eed63902d3be98f0913765","name":"https://git.kernel.org/stable/c/9a12fa5213cfc391e0eed63902d3be98f0913765","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9560e6fee887a9594a89fa265b5b9c79b1591803","name":"https://git.kernel.org/stable/c/9560e6fee887a9594a89fa265b5b9c79b1591803","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64172","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64172","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8de4a1c8164e5b2e40d1df764840a31de983f40b 94ade38f317ea086a181db0e6b69c574b3b70a5e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8de4a1c8164e5b2e40d1df764840a31de983f40b 9560e6fee887a9594a89fa265b5b9c79b1591803 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8de4a1c8164e5b2e40d1df764840a31de983f40b 9a12fa5213cfc391e0eed63902d3be98f0913765 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * 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/svm/avic.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"94ade38f317ea086a181db0e6b69c574b3b70a5e","status":"affected","version":"8de4a1c8164e5b2e40d1df764840a31de983f40b","versionType":"git"},{"lessThan":"9560e6fee887a9594a89fa265b5b9c79b1591803","status":"affected","version":"8de4a1c8164e5b2e40d1df764840a31de983f40b","versionType":"git"},{"lessThan":"9a12fa5213cfc391e0eed63902d3be98f0913765","status":"affected","version":"8de4a1c8164e5b2e40d1df764840a31de983f40b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/svm/avic.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)\n\nHygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and\nshare the same erratum #1235: hardware may read a stale IsRunning=1 bit\nduring ICR write emulation and silently fail to generate an\nAVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU.\n\nThe absence of the VM-Exit causes KVM to miss the required wakeup of\nblocking target vCPUs, leading to hung vCPUs and unbounded delays in\nguest execution.\n\nExtend the existing AMD Family 17h erratum #1235 workaround to also cover\nHygon Family 18h.  With IPI virtualization disabled, KVM never sets\nIsRunning=1 in the Physical ID table, so every non-self IPI generates a\nVM-Exit and is correctly emulated."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:57.153Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/94ade38f317ea086a181db0e6b69c574b3b70a5e"},{"url":"https://git.kernel.org/stable/c/9560e6fee887a9594a89fa265b5b9c79b1591803"},{"url":"https://git.kernel.org/stable/c/9a12fa5213cfc391e0eed63902d3be98f0913765"}],"title":"KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64172","datePublished":"2026-07-19T15:40:57.153Z","dateReserved":"2026-07-19T07:54:57.039Z","dateUpdated":"2026-07-19T15:40:57.153Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:59","lastModifiedDate":"2026-07-19 16:17:59","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64172","Ordinal":"1","Title":"KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (e","CVE":"CVE-2026-64172","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64172","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)\n\nHygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and\nshare the same erratum #1235: hardware may read a stale IsRunning=1 bit\nduring ICR write emulation and silently fail to generate an\nAVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU.\n\nThe absence of the VM-Exit causes KVM to miss the required wakeup of\nblocking target vCPUs, leading to hung vCPUs and unbounded delays in\nguest execution.\n\nExtend the existing AMD Family 17h erratum #1235 workaround to also cover\nHygon Family 18h.  With IPI virtualization disabled, KVM never sets\nIsRunning=1 in the Physical ID table, so every non-self IPI generates a\nVM-Exit and is correctly emulated.","Type":"Description","Title":"KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (e"}]}}}