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CVE-2026-13322— Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service

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.

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存在资源管理错误漏洞，该漏洞源于downward metrics virtio-serial服务在读取客户请求时使用无长度限制的缓冲方式，可能导致virt-handler进程内存无限分配直至被OOM-kill。

CVSS 3.8 · Low EPSS 0.09% · P1

Affected Version Matrix 2

VendorProduct Version RangeStatus
Red Hat Red Hat OpenShift Virtualization 4 any affected
any affected
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I. Basic Information for CVE-2026-13322

Vulnerability Information
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Vulnerability Title
Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in KubeVirt's downward metrics virtio-serial server. The server reads guest requests using textproto.Reader.ReadLine(), which buffers input indefinitely until a newline character is received, with no length limit or read deadline. A user with access to a VM guest that has the downward metrics virtio-serial device configured can write a continuous byte stream to the device, causing unbounded memory allocation in the virt-handler process until it is OOM-killed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
KubeVirt 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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存在资源管理错误漏洞，该漏洞源于downward metrics virtio-serial服务在读取客户请求时使用无长度限制的缓冲方式，可能导致virt-handler进程内存无限分配直至被OOM-kill。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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-2026-13322

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III. Intelligence Information for CVE-2026-13322

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Vendor Advisories for CVE-2026-13322 (1)

Other References for CVE-2026-13322 (1)

IV. Related Vulnerabilities

Same product: Red Hat OpenShift Virtualization 4
Same vendor: Red Hat
Same weakness: CWE-770

V. Comments for CVE-2026-13322

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