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

{
  "id": "3a17081bd57eeba6b97a24157abd513e23109f7f75bb00c38ccb6f08938af92a",
  "url": "https://osv.dev/vulnerability/CVE-2026-96812",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Host Root Sandbox Escape in gVisor via Character Device Passthrough and CUSE",
    "summary": "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.",
    "evidence": "osv:CVE-2026-96812",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-96812",
      "aliases": [
        "CVE-2026-96812"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/google/gvisor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "573a9e73cf844f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "573a9e73cf844f"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "573a9e73cf844f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "573a9e73cf844f"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-96812.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.015626046Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96812.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-96812",
        "https://github.com/google/gvisor/commit/573a9e73cf844f",
        "https://github.com/google/gvisor"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-269",
          "CWE-668"
        ],
        "cna_assigner": "Google",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96812.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-96812",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507627,
  "published_at": "2026-09-25T14:47:47.41+00:00"
}