CVE-2026-47243— Kata Containers 路径遍历漏洞

Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs

Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. Prior to 3.31.0, the runtime-rs standalone virtio-fs path is vulnerable to a guest-root to host-root escape. In this configuration, Kata runs the host virtiofsd as root with --sandbox none --seccomp none, so an attacker with root-equivalent access inside the guest can bypass the guest virtio-fs client entirely by taking over the virtio-fs PCI device and building a virtqueue in userspace to submit raw FUSE requests directly to the host virtiofsd. A crafted FUSE_SYMLINK request whose new symlink name is an absolute host path is honored outside the configured shared directory, allowing guest root to create root-owned symlinks in sensitive host locations such as /etc/cron.d. By pointing such a symlink at a guest-controlled crontab payload reachable through a live runtime process's mount namespace, the attacker causes the host cron daemon to execute that payload as host root, crossing the Kata isolation boundary. This issue is fixed in version 3.31.0.

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

对路径名的限制不恰当(路径遍历)

Kata Containers 路径遍历漏洞

WordPress Formidable Forms是WordPress基金会开源的一款表单创建插件。 Kata Containers 3.31.0之前版本存在路径遍历漏洞，该漏洞源于virtio-fs路径处理不当，允许具有root权限的攻击者绕过guest virtio-fs客户端，通过提交特制FUSE_SYMLINK请求在共享目录之外创建符号链接，可能导致从guest root逃逸至host root并执行任意代码。

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