{"id":"CVE-2026-98390","revision":"21155594b89a45e39a57a31727e28028","records":[{"revision":"21155594b89a45e39a57a31727e28028","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98390","aliases":[],"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":0,"publishedAt":"2026-10-14T13:25:54.905+00:00","modifiedAt":"2026-10-19T09:18:41.175+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/kernel/amd_node.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0a4b61d9c2e496b5f0a10e29e355a1465c8738bb\",\n                            \"lessThan\": \"9273a90465d58b82aca4bea71451ef6bee084928\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a4b61d9c2e496b5f0a10e29e355a1465c8738bb\",\n                            \"lessThan\": \"94e984d8858a3228952b02f84e66610961098cc2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a4b61d9c2e496b5f0a10e29e355a1465c8738bb\",\n                            \"lessThan\": \"72bd92bd8190d7869ecb462649ca40f297822a33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4ad899a33198ab6335732c769835d035e66894a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.17.8\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/kernel/amd_node.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928","https://git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2","https://git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98390","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98390","identifiers":["CVE-2026-98390"]},"retained":false,"historicalAffected":[]}],"coverage":[]}