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.
History

Wed, 30 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Kubevirt
Kubevirt kubevirt
Vendors & Products Kubevirt
Kubevirt kubevirt

Wed, 30 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 29 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 29 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume
First Time appeared Redhat
Redhat container Native Virtualization
Weaknesses CWE-476
CPEs cpe:/a:redhat:container_native_virtualization:4
Vendors & Products Redhat
Redhat container Native Virtualization
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-09-29T17:06:07.937Z

Updated: 2026-09-29T19:51:25.376Z

Reserved: 2026-09-29T14:35:37.210Z

Link: CVE-2026-102623

cve-icon Vulnrichment

Updated: 2026-09-29T19:51:15.534Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-29T17:17:06.843

Modified: 2026-09-29T21:29:07.663

Link: CVE-2026-102623

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-29T00:00:00Z

Links: CVE-2026-102623 - Bugzilla