What is CVE-2026-102623?

CVE-2026-102623 is a medium-severity vulnerability in Red Hat Openshift Virtualization 4, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-09-29.

How severe is CVE-2026-102623?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Red Hat Openshift Virtualization 4

CVE-2026-102623

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.

Published 2026-09-29 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Red Hat Openshift Virtualization 4

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

access.redhat.com/security/cve/CVE-2026-102623 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-102623?: CVE-2026-102623 is a medium-severity vulnerability in Red Hat Openshift Virtualization 4, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-09-29.
How severe is CVE-2026-102623?: Medium severity. CVSS v3 base score is 6.5 out of 10.