ubuntu-cve-2026-8933
Vulnerability from osv_ubuntu
Published
2026-07-21 14:00
Modified
2026-07-21 21:01
Summary
Details

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.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
high
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.76+ubuntu22.04.1"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.76+ubuntu22.04.1"
          }
        ],
        "priority_reason": "Local Privilege Escalation"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.76+ubuntu22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.76+ubuntu22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.53+21.10ubuntu1",
        "2.54.2+22.04ubuntu1",
        "2.54.2+22.04ubuntu2",
        "2.54.2+22.04ubuntu3",
        "2.54.3+git19.g868fc21+22.04",
        "2.54.3+git26.g360067e+22.04",
        "2.55.2+22.04",
        "2.55.2+22.04.1",
        "2.55.3+22.04",
        "2.55.3+22.04ubuntu1",
        "2.55.5+22.04",
        "2.56.2+22.04ubuntu1",
        "2.57.4+22.04",
        "2.57.5+22.04",
        "2.57.5+22.04ubuntu0.1",
        "2.58+22.04",
        "2.58+22.04.1",
        "2.61.3+22.04",
        "2.62+22.04",
        "2.63+22.04",
        "2.63+22.04ubuntu0.1",
        "2.65.3+22.04",
        "2.66.1+22.04",
        "2.67.1+22.04",
        "2.68.5+ubuntu22.04.1",
        "2.71+ubuntu22.04",
        "2.72+ubuntu22.04",
        "2.73+ubuntu22.04",
        "2.73+ubuntu22.04.1",
        "2.74.1+ubuntu22.04.4",
        "2.75.2+ubuntu22.04",
        "2.76+ubuntu22.04"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.76+ubuntu24.04.1"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.76+ubuntu24.04.1"
          }
        ],
        "priority_reason": "Local Privilege Escalation"
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.76+ubuntu24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.76+ubuntu24.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.60.4+23.10",
        "2.61.3+24.04",
        "2.62+24.04build1",
        "2.63+24.04",
        "2.63+24.04ubuntu0.1",
        "2.63.1+24.04",
        "2.65.3+24.04",
        "2.66.1+24.04",
        "2.67.1+24.04",
        "2.68.5+ubuntu24.04.1",
        "2.71+ubuntu24.04",
        "2.72+ubuntu24.04",
        "2.73+ubuntu24.04",
        "2.73+ubuntu24.04.1",
        "2.73+ubuntu24.04.2",
        "2.74.1+ubuntu24.04.4",
        "2.75.2+ubuntu24.04",
        "2.76+ubuntu24.04"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.76+ubuntu26.04.3"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.76+ubuntu26.04.3"
          }
        ],
        "priority_reason": "Local Privilege Escalation"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.76+ubuntu26.04.3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.76+ubuntu26.04.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.71.1+ubuntu25.10.1",
        "2.72+ubuntu26.04.1",
        "2.73+ubuntu26.04.1",
        "2.74+ubuntu26.04",
        "2.74.1+ubuntu26.04",
        "2.74.1+ubuntu26.04.3",
        "2.74.1+ubuntu26.04.4",
        "2.75.2+ubuntu26.04.2",
        "2.76+ubuntu26.04.2"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-8933",
  "modified": "2026-07-21T21:01:19Z",
  "published": "2026-07-21T14:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-8933"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8933"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8579-1"
    }
  ],
  "related": [
    "USN-8579-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-8933"
  ]
}



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