snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup

{
  "id": "8b8f77a47a3fd7cfad254a0b0b75251a87654d68ae2848b0bf33d64dcfb71855",
  "url": "https://osv.dev/vulnerability/CVE-2026-8933",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup",
    "summary": "A local privilege escalation vulnerability exists in snap-confine, a set-capabilities core component used internally by Canonical snapd to construct the secure execution environment for snap applications. This vulnerability uniquely affects versions of snap-confine configured with set-capabilities (rather than standard set-uid-root installations). Due to a flaw in how privilege boundaries or security sandboxes are initialized when the binary runs under limited ambient capabilities, a local, unprivileged attacker can exploit this behavior to bypass intended restrictions and execute arbitrary code. Successful exploitation allows the local user to elevate their privileges to full root authority.",
    "evidence": "osv:CVE-2026-8933",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-8933",
      "aliases": [
        "CVE-2026-8933"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/canonical/snapd",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "120ec00365ceab53039ab25863ef73539b5a1647"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.75.0"
                      },
                      {
                        "fixed": "2.76.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.76",
            "untagged-ec50ee5bfb45daefc236",
            "2.15.2",
            "2.15",
            "2.14.2.16.04",
            "2.14.1",
            "2.14",
            "2.13",
            "2.12",
            "2.11",
            "2.0.10",
            "2.0.9",
            "2.0.8",
            "2.0.7",
            "2.0.6",
            "2.0.5",
            "2.0.4",
            "2.0.3",
            "2.0",
            "1.9.4",
            "1.9.3",
            "1.9.2",
            "1.9.1",
            "1.9",
            "ppa",
            "1.7.3+20160310ubuntu1",
            "1.7.3+20160308ubuntu1",
            "1.7.3+20160303ubuntu4",
            "1.7.3+20160303ubuntu3",
            "1.7.3+20160303ubuntu2",
            "1.7.3+20160303ubuntu1",
            "1.7.3+20160225ubuntu1",
            "1.7.2+20160223ubuntu1",
            "1.7.2+20160204ubuntu1",
            "1.7.2+20160113ubuntu1",
            "1.7.2ubuntu1",
            "1.7ubuntu1",
            "1.6ubuntu1",
            "1.5ubuntu1",
            "1.4ubuntu1",
            "1.3ubuntu1",
            "1.2-0ubuntu1",
            "1.1.2-0ubuntu1",
            "1.1.1-0ubuntu1",
            "1.1-0ubuntu1",
            "1.0.1-0ubuntu1",
            "1.0-0ubuntu1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8933.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.521193357Z",
      "provider": "osv",
      "references": [
        "https://github.com/canonical",
        "https://github.com/canonical/snapd/",
        "https://launchpad.net/ubuntu/+source/snapd",
        "https://launchpad.net/ubuntu/jammy",
        "https://launchpad.net/ubuntu/noble",
        "https://launchpad.net/ubuntu/resolute",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8933.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-8933",
        "https://ubuntu.com/security/CVE-2026-8933"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-250"
        ],
        "cna_assigner": "canonical",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8933.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-8933",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521300,
  "published_at": "2026-07-21T14:02:19.758+00:00"
}