CVE-2026-102623

Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume

Published Sep 29, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Kubevirt
Kubevirt kubevirt
Vendors & Products Kubevirt
Kubevirt kubevirt
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Sep 29, 2026, 7:51 PM
Reserved
Sep 29, 2026, 2:35 PM
Status
Awaiting Analysis
Published
Sep 29, 2026, 5:17 PM
Modified
Sep 29, 2026, 9:29 PM
Severity
Moderate
Public date
Sep 29, 2026, 12:00 AM