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

Quick assessment

Affected
Red Hat Red Hat OpenShift Virtualization 4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-102623

Vulnerability Information

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Vulnerability Title
Kubevirt: kubevirt: virt-controller nil-pointer dereference via malformed ephemeral volume
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenShift Virtualization 4 - cpe:/a:redhat:container_native_virtualization:4
Red Hat Red Hat OpenShift Virtualization 4 - cpe:/a:redhat:container_native_virtualization:4

II. Public POCs for CVE-2026-102623

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III. Intelligence Information for CVE-2026-102623

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Other References for CVE-2026-102623 (2)

Same Patch Batch · Red Hat · 2026-09-29 · 12 CVEs total

CVE-2026-102560 8.6 HIGH Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth
CVE-2026-102559 8.6 HIGH Libsoup: libsoup: heap buffer overflow during websocket client-frame masking
CVE-2026-102558 8.6 HIGH Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth
CVE-2026-102557 8.6 HIGH Libsoup: libsoup: heap buffer overflow during websocket message reassembly
CVE-2026-102556 8.6 HIGH Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion
CVE-2026-102555 8.2 HIGH Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decodin
CVE-2026-95520 7.1 HIGH Rpm: rpm: integer overflow in iterreadarchivenext() leads to heap-based buffer overflow wh
CVE-2026-97024 7.1 HIGH Flatpak: flatpak: arbitrary write in root context via path traversal in deploy directory f
CVE-2026-97029 5.7 MEDIUM Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
CVE-2026-102473 5.5 MEDIUM Dash: dash: super-polynomial backtracking in pmatch when libc fnmatch is disabled
CVE-2026-102474 4.0 MEDIUM Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservat

IV. Related Vulnerabilities

Same product: Red Hat OpenShift Virtualization 4
Same vendor: Red Hat
Same weakness: CWE-476

V. Comments for CVE-2026-102623

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