Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE (CVE-2026-96812) | HOL Guard CVE

High · CVSS 8.8CVE-2026-96812

Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE

Answer in brief

CVE-2026-96812 records a High severity (CVSS 8.8) vulnerability in Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE. The current sources do not mark it as known exploited. The current feed maps Google/gVisor (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Google/gVisor (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Google/gVisorgeneric	>=0 <573a9e73cf844f	573a9e73cf844f

Recommended response

Check inventory. Check lockfiles and deployed manifests for Google/gVisor.
Review the reported fix. Update Google/gVisor to 573a9e73cf844f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.