CVE-2026-47243— Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs
Quick assessment
Affected
kata-containers kata-containers
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 3 AI
T1034 T1059 · Command and Scripting Interpreter T1610 · Deploy ContainerAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| kata-containers | kata-containers | < 3.31.0 |
affected |
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I. Basic Information for CVE-2026-47243
Vulnerability Information
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Vulnerability Title
Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Kata Containers 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
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 |
|---|---|---|---|---|
| kata-containers | kata-containers | < 3.31.0 | - |
|
II. Public POCs for CVE-2026-47243
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Qwen3.6-35B-A3B
· 8165 chars
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III. Intelligence Information for CVE-2026-47243
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Vendor Advisories for CVE-2026-47243 (1)
Same Patch Batch · kata-containers · 2026-08-07 · 3 CVEs total
| CVE-2026-50540 | 9.6 CRITICAL | Kata Containers: Config Path Annotation Arbitrary File Loading |
| CVE-2026-64676 | 5.7 MEDIUM | Kata Containers: Unauthorized mem-agent ttRPC methods let an untrusted host tamper with co |
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V. Comments for CVE-2026-47243
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