Medium severity · published Sep 29, 2026
CVE-2026-102623
Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat OpenShift Virtualization 4 · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat OpenShift Virtualization 4
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102623
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102623
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-102623
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2543219
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