{"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":"none","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"}],"tags":["nvd"],"ingestedAt":"2026-10-14T15:36:13.976Z","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.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}