Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume (CVE-2026-102623) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-102623

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

Answer in brief

CVE-2026-102623 records a Medium severity (CVSS 6.5) vulnerability in Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume. The current sources do not mark it as known exploited. The current feed maps Red Hat/container-native-virtualization/virt-controller (generic), Red Hat/container-native-virtualization/virt-controller-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/container-native-virtualization/virt-controller (generic), Red Hat/container-native-virtualization/virt-controller-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/container-native-virtualization/virt-controllergeneric	*	Not reported
Red Hat/container-native-virtualization/virt-controller-rhel9generic	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/container-native-virtualization/virt-controller, Red Hat/container-native-virtualization/virt-controller-rhel9.
Review the reported fix. Source-reported 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.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.