CVE-2026-27211— Cloud hypervisor 安全漏洞

Cloud Hypervisor: Host File Exfiltration via QCOW Backing File Abuse

Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to arbitrary host file exfiltration (constrained by process privileges) when using virtio-block devices backed by raw images. A malicious guest can overwrite its disk header with a crafted QCOW2 structure pointing to a sensitive host path. Upon the next VM boot or disk scan, the image format auto-detection parses this header and serves the host file's contents to the guest. Guest-initiated VM reboots are sufficient to trigger a disk scan and do not cause the Cloud Hypervisor process to exit. Therefore, a single VM can perform this attack without needing interaction from the management stack. Successful exploitation requires the backing image to be either writable by the guest or sourced from an untrusted origin. Deployments utilizing only trusted, read-only images are not affected. This issue has been fixed in version 50.1. To workaround, enable land lock sandboxing and restrict process privileges and access.

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文件名或路径的外部可控制

Cloud hypervisor 安全漏洞

Cloud hypervisor是Cloud hypervisor公司的适用于现代云工作负载的虚拟机监视器。 Cloud hypervisor 34.0版本至50.0版本存在安全漏洞，该漏洞源于使用原始镜像支持的virtio-block设备时存在缺陷，可能导致任意主机文件泄露。

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