What’s Vulnerable › Vulnerabilities

CVE-2026-102623: Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-29 · updated 2026-09-29
• Weakness: CWE-476

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.

Affected products

• Red Hat OpenShift Virtualization 4: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-102623
• https://bugzilla.redhat.com/show_bug.cgi?id=2543219

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