{"id":"CVE-2026-98390","title":"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","summary":"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 …","severity":"medium","published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:49.873","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98390","references":[{"url":"https://git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98390.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98390"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552195"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98390"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98390"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98390.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-14T15:36:13.976Z","vendor":"Linux","product":"Linux","affected":["Linux >= 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb < 9273a90465d58b82aca4bea71451ef6bee084928","Linux >= 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb < 94e984d8858a3228952b02f84e66610961098cc2","Linux >= 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb < 72bd92bd8190d7869ecb462649ca40f297822a33","Linux c4ad899a33198ab6335732c769835d035e66894a","Linux >= 6.17.8 < 6.18","Linux 6.18"],"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-369"],"epss":0.00203,"epssPercentile":0.10201,"slug":"CVE-2026-98390","body":"## Overview\n\nIn 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. ]\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98390.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224111,"id":"CVE-2026-98390","ts":1792324925472,"field":"cvss","old":null,"new":"5.5"},{"seq":224110,"id":"CVE-2026-98390","ts":1792324925472,"field":"severity","old":"none","new":"medium"}]}