{"id":"CVE-2026-96812","state":"PUBLISHED","title":"Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE","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.","publishedAt":"2026-09-25T14:47:47.410Z","updatedAt":"2026-09-25T16:07:52.560Z","severity":{"score":8.8,"label":"High","version":"4.0","vector":"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":"Google"},"assigner":"Google","products":["Google gVisor"],"affected":[{"vendor":"Google","product":"gVisor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"573a9e73cf844f","versionType":"git"}],"platforms":["Linux"],"repo":"https://github.com/google/gvisor"}],"references":["https://github.com/google/gvisor/commit/573a9e73cf844f"],"weaknesses":["CWE-668","CWE-269"],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/96xxx/CVE-2026-96812.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-96812","state":"PUBLISHED","datePublished":"2026-09-25T14:47:47.410Z","dateUpdated":"2026-09-25T16:07:52.560Z","assignerShortName":"Google","assignerOrgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateReserved":"2026-09-23T17:12:31.415Z"},"containers":{"cna":{"title":"Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Google","product":"gVisor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"573a9e73cf844f","versionType":"git"}],"platforms":["Linux"],"repo":"https://github.com/google/gvisor"}],"references":[{"url":"https://github.com/google/gvisor/commit/573a9e73cf844f"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"HIGH","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-668","lang":"en","description":"CWE-668 Exposure of Resource to Wrong Sphere","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-269","lang":"en","description":"CWE-269 Improper Privilege Management","type":"CWE"}]}],"providerMetadata":{"shortName":"Google","orgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateUpdated":"2026-09-25T14:47:47.410Z"},"impacts":[{"capecId":"CAPEC-480","descriptions":[{"lang":"en","value":"CAPEC-480 Escaping Virtualization"}]},{"capecId":"CAPEC-233","descriptions":[{"lang":"en","value":"CAPEC-233 Privilege Escalation"}]}],"credits":[{"lang":"en","value":"Anthropic (using Claude)","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Aegis CNA Automation"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-25T16:07:43.360610Z","id":"CVE-2026-96812","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-25T16:07:52.560Z"}}]}}}