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CVE-2026-96812— Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE

Quick assessment

Affected
Google gVisor
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.

在 Linux 平台上启用了 CUSE（Character Device in Userspace）功能的 Google gVisor 中，主机文件辅助程序（gofer）存在对资源到错误域的不当暴露问题（漏洞发生在 commit 573a9e73cf844f 之前）。本地攻击者若具备容器镜像部署权限，可利用此漏洞在主机系统上实现以 root 权限执行代码。具体而言，攻击者通过在容器镜像中包含一个 /dev/cuse 字符设备节点，使设备打开操作穿透至主机，从而允许被沙箱隔离的攻击者注册主机设备，并利用 CUSE 无

CVSS 8.8 · High EPSS 0.10% · P1
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I. Basic Information for CVE-2026-96812

Vulnerability Information
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Vulnerability Title
Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Exposure of Resource to Wrong Sphere in the host file helper (gofer) in Google gVisor prior to commit 573a9e73cf844f on Linux platforms with CUSE enabled allows a local attacker with container image deployment privileges to achieve root code execution on the host system. By including a /dev/cuse character device node in a container image, opening the device passes through to the host, allowing the sandboxed attacker to register a host device and exploit CUSE unrestricted ioctl handling to overwrite root udev helper memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google gVisor 0 ~ 573a9e73cf844f -

II. Public POCs for CVE-2026-96812

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III. Intelligence Information for CVE-2026-96812

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Patches & Fixes for CVE-2026-96812 (1)

IV. Related Vulnerabilities

Same product: gVisor
Same vendor: Google
Same weakness: CWE-668

V. Comments for CVE-2026-96812

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