{"api_version":"1","generated_at":"2026-10-27T04:29:10+00:00","cve":"CVE-2026-98390","urls":{"html":"https://cve.report/CVE-2026-98390","api":"https://cve.report/api/cve/CVE-2026-98390.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98390","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98390"},"summary":{"title":"x86/amd_node: Avoid divide by zero on virtualized systems","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/amd_node: Avoid divide by zero on virtualized systems\n\nOn a virtualized system, the number of nodes does not have a relationship to\nthe number of roots.  A Xen PVH dom0 can calculate roots_per_node as 0, which\ncrashes with a divide by zero in:\n\n  if (count++ % roots_per_node)\n\nbecause the underlying topology code on Xen ends up making num_nodes\n2 and num_roots 1 and the integer division result is 0.\n\nThe issue is seen with Xen, but it could affect other systems.\n\nSet roots_per_node to 1 in this case. Print a firmware bug when this is\nperformed for non-virtualized systems.\n\n  [ bp: Massage commit message. ]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-14 14:17:49","updated_at":"2026-10-19 10:18:42"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928","name":"https://git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33","name":"https://git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2","name":"https://git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98390","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98390","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb 9273a90465d58b82aca4bea71451ef6bee084928 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb 94e984d8858a3228952b02f84e66610961098cc2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb 72bd92bd8190d7869ecb462649ca40f297822a33 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c4ad899a33198ab6335732c769835d035e66894a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17.8 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 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/kernel/amd_node.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9273a90465d58b82aca4bea71451ef6bee084928","status":"affected","version":"0a4b61d9c2e496b5f0a10e29e355a1465c8738bb","versionType":"git"},{"lessThan":"94e984d8858a3228952b02f84e66610961098cc2","status":"affected","version":"0a4b61d9c2e496b5f0a10e29e355a1465c8738bb","versionType":"git"},{"lessThan":"72bd92bd8190d7869ecb462649ca40f297822a33","status":"affected","version":"0a4b61d9c2e496b5f0a10e29e355a1465c8738bb","versionType":"git"},{"status":"affected","version":"c4ad899a33198ab6335732c769835d035e66894a","versionType":"git"},{"lessThan":"6.18","status":"affected","version":"6.17.8","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kernel/amd_node.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","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":"6.18.53","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/amd_node: Avoid divide by zero on virtualized systems\n\nOn a virtualized system, the number of nodes does not have a relationship to\nthe number of roots.  A Xen PVH dom0 can calculate roots_per_node as 0, which\ncrashes with a divide by zero in:\n\n  if (count++ % roots_per_node)\n\nbecause the underlying topology code on Xen ends up making num_nodes\n2 and num_roots 1 and the integer division result is 0.\n\nThe issue is seen with Xen, but it could affect other systems.\n\nSet roots_per_node to 1 in this case. Print a firmware bug when this is\nperformed for non-virtualized systems.\n\n  [ bp: Massage commit message. ]"}],"providerMetadata":{"dateUpdated":"2026-10-19T09:18:41.175Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928"},{"url":"https://git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2"},{"url":"https://git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33"}],"title":"x86/amd_node: Avoid divide by zero on virtualized systems","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98390","datePublished":"2026-10-14T13:25:54.905Z","dateReserved":"2026-09-25T10:25:14.346Z","dateUpdated":"2026-10-19T09:18:41.175Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-14 14:17:49","lastModifiedDate":"2026-10-19 10:18:42","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98390","Ordinal":"1","Title":"x86/amd_node: Avoid divide by zero on virtualized systems","CVE":"CVE-2026-98390","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98390","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/amd_node: Avoid divide by zero on virtualized systems\n\nOn a virtualized system, the number of nodes does not have a relationship to\nthe number of roots.  A Xen PVH dom0 can calculate roots_per_node as 0, which\ncrashes with a divide by zero in:\n\n  if (count++ % roots_per_node)\n\nbecause the underlying topology code on Xen ends up making num_nodes\n2 and num_roots 1 and the integer division result is 0.\n\nThe issue is seen with Xen, but it could affect other systems.\n\nSet roots_per_node to 1 in this case. Print a firmware bug when this is\nperformed for non-virtualized systems.\n\n  [ bp: Massage commit message. ]","Type":"Description","Title":"x86/amd_node: Avoid divide by zero on virtualized systems"}]}}}