---
id: CVE-2026-98390
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/amd_node: Avoid divide by zero on virtualized systems

  On a virtualized system, the number of nodes does not have a relationship to
  the number of roots
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/amd_node: Avoid divide by zero on virtualized systems

  On a virtualized system, the number of nodes does not have a relationship to
  the 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'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

x86/amd_node: Avoid divide by zero on virtualized systems

On a virtualized system, the number of nodes does not have a relationship to
the number of roots.  A Xen PVH dom0 can calculate roots_per_node as 0, which
crashes with a divide by zero in:

  if (count++ % roots_per_node)

because the underlying topology code on Xen ends up making num_nodes
2 and num_roots 1 and the integer division result is 0.

The issue is seen with Xen, but it could affect other systems.

Set roots_per_node to 1 in this case. Print a firmware bug when this is
performed for non-virtualized systems.

  [ bp: Massage commit message. ]

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.