---
id: CVE-2026-102623
title: A flaw was found in KubeVirt
summary: >-
  A flaw was found in KubeVirt. An authenticated user with permission to create
  Virtual Machine Instances (VMIs) can cause a Denial of Service (DoS) by
  submitting a virtual machine definition with an empty ephemeral volume. The
  virt-contro…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: Red Hat
product: container-native-virtualization/virt-controller
affected:
  - container-native-virtualization/virt-controller (all versions)
  - container-native-virtualization/virt-controller-rhel9 (all versions)
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T20:17:17.120'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102623'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102623'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543219'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-29T19:51:07.457292Z'
ingestedAt: '2026-09-29T17:41:02.204Z'
---

## Overview

A flaw was found in KubeVirt. An authenticated user with permission to create Virtual Machine Instances (VMIs) can cause a Denial of Service (DoS) by submitting a virtual machine definition with an empty ephemeral volume. The virt-controller component fails to properly validate the volume configuration, leading to an unhandled exception and application crash during processing. Because the malformed definition persists in the cluster, the controller enters a continuous crash loop, disrupting virtual machine lifecycle operations across the entire environment.

## Remediation

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