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CVE-2026-96812

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

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.13%Unchanged since Sep 26, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.8

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.

Record
CVE-2026-96812
CVSS 4.0
8.8 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weakness
CWE-668, CWE-269
Updated
2026-11-02
EUVDEUVD-2026-87111 8.8

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.

Record
EUVD-2026-87111
CVSS 4.0
8.8 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-3chr-j932-q9pc 8.8

Improper Exposure of Resource to Wrong Sphere in the host file helper (gofer) in Google gVisor...

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.

Record
GHSA-3chr-j932-q9pc
CVSS 4.0
8.8 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-269
Updated
2026-11-02
NVD 8.8

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.

Record
CVE-2026-96812
CVSS 4.0
8.8 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-269, CWE-668
Updated
2026-11-02
OSV 8.8

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.

Record
CVE-2026-96812
CVSS 4.0
8.8 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weakness
CWE-269, CWE-668
Updated
2026-11-02
OSVDEBIAN-CVE-2026-96812 8.8

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.

Record
DEBIAN-CVE-2026-96812
CVSS 4.0
8.8 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-07

Affected products

Affected packages

Affected packages
PackageAffectedFixed
golang-gvisor-gvisor
Debian:12
All versions, plus listed versions
0.0~20221219.0-20.0~20230807.0-10.0~20230807.0-20.0~20230807.0-30.0~20230807.0-4
Show 14 moreShow less
0.0~20230807.0-4~bpo12+10.0~20230807.0-50.0~20240729.0-10.0~20240729.0-20.0~20240729.0-30.0~20240729.0-40.0~20240729.0-4~bpo12+10.0~20240729.0-4~bpo12+20.0~20240729.0-50.0~20240729.0-60.0~20240729.0-70.0~20261026.0-10.0~20261026.0-20.0~20261026.0-3
None known
golang-gvisor-gvisor
Debian:13
All versions, plus listed versions
0.0~20240729.0-40.0~20240729.0-50.0~20240729.0-60.0~20240729.0-70.0~20261026.0-10.0~20261026.0-20.0~20261026.0-3
None known
golang-gvisor-gvisor
Debian:14
before 0.0~20261026.0-1, plus listed versions
0.0~20240729.0-40.0~20240729.0-50.0~20240729.0-60.0~20240729.0-7
0.0~20261026.0-1

History

History
RecordedChangedSources
affected, factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-96812 is a high vulnerability (CVSS 8.8) in Google Gvisor, published September 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. Fixed in golang-gvisor-gvisor 0.0~20261026.0-1.

References

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