Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE
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.
CVE-2026-96812
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-96812
gVisor
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/google/gvisor",
"vendor": "Google",
"product": "gVisor",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "573a9e73cf844f",
"versionType": "git"
}
],
"platforms": [
"Linux"
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-96812
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #2156 · Revision 1
- Added to Heist Feed
- Publisher date