CVE-2026-13434— KubeVirt 输入验证错误漏洞

Virt-controller-rhel9: kubevirt: kubevirt: multus default-network annotation injection via unvalidated tenant networkname when externalnetresourceinjection is enabled

A flaw was found in KubeVirt's network annotation generator. When a tenant creates a VirtualMachineInstance with a Multus network configuration, the supplied networkName value is written verbatim into the launcher pod's v1.multus-cni.io/default-network annotation without format validation or sanitization. The only admission check rejects empty strings; no DNS-1123 format validation, JSON detection, or special character rejection is performed. When the ExternalNetResourceInjection Beta feature gate is enabled (off by default, cluster-admin only), the NAD lookup that would otherwise catch malformed names is skipped by design. A tenant with kubevirt.io:edit permissions can inject a JSON-formatted NetworkSelectionElement array specifying an arbitrary namespace, NAD name, static IP address, and MAC address. Multus on the node parses this JSON and attaches the launcher pod to the specified network attachment in any namespace, enabling cross-namespace network access and IP/MAC impersonation on network segments normally segregated from tenant workloads. The ExternalNetResourceInjection feature gate was introduced in KubeVirt v1.8.0 (first shipped in OpenShift Virtualization 4.21).

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

输入验证不恰当

KubeVirt 输入验证错误漏洞

KubeVirt是KubeVirt组织开源的一款用于在 Kubernetes 上直接运行和管理虚拟机的开源工具，让容器化应用和传统虚拟机工作负载可以在同一个平台上共存。 KubeVirt存在输入验证错误漏洞，该漏洞源于KubeVirt网络注解生成器未对networkName参数进行格式验证或清理，可能允许具有kubevirt.io:edit权限的租户注入JSON格式的NetworkSelectionElement数组，指定任意命名空间、NAD名称、静态IP地址和MAC地址，从而跨命名空间访问网络并伪造IP

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