Vulnerability-Lookup

CVE-2026-8933 (GCVE-0-2026-8933)

Vulnerability from cvelistv5 – Published: 2026-07-21 14:02 – Updated: 2026-07-22 18:28

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-250 - Execution with unnecessary privileges

Assigner

canonical

References

1 reference

URL	Tags
https://ubuntu.com/security/CVE-2026-8933	vdb-entryissue-tracking

Impacted products

4 products

Vendor	Product	Version
		Affected: 2.75.0 , < 2.76.1 (semver)
Canonical	Ubuntu 26.04 LTS	Unaffected: 2.76+ubuntu26.04.3 (dpkg)
Canonical	Ubuntu 24.04 LTS	Unaffected: 2.76+ubuntu24.04.1 (dpkg)
Canonical	Ubuntu 22.04 LTS	Unaffected: 2.76+ubuntu22.04.1 (dpkg)

Date Public

2026-07-21 02:00

Credits

Qualys Security Advisory Team

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-8933

Vulnerability from fkie_nvd - Published: 2026-07-21 15:16 - Updated: 2026-07-22 19:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security@ubuntu.com	https://ubuntu.com/security/CVE-2026-8933

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/canonical",
          "defaultStatus": "unaffected",
          "packageName": "snapd",
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          "versions": [
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              "lessThan": "2.76.1",
              "status": "affected",
              "version": "2.75.0",
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            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/resolute",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
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          ],
          "product": "Ubuntu 26.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "status": "unaffected",
              "version": "2.76+ubuntu26.04.3",
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        },
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        },
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          "defaultStatus": "affected",
          "packageName": "snapd",
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          ],
          "product": "Ubuntu 22.04 LTS",
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GHSA-FXQR-J4GX-622C

Vulnerability from github – Published: 2026-07-21 15:30 – Updated: 2026-07-21 15:30

Details

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-8933"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-250"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T15:16:39Z",
    "severity": "HIGH"
  },
  "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).\nDue 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": "GHSA-fxqr-j4gx-622c",
  "modified": "2026-07-21T15:30:45Z",
  "published": "2026-07-21T15:30:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8933"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2026-8933"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-8933

Vulnerability from osv_ubuntu

Published

2026-07-21 14:00

Modified

2026-07-21 21:01

Summary

Details

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

URL

Type

	https://ubuntu.com/security/CVE-2026-8933	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-8933	REPORT
	https://ubuntu.com/security/notices/USN-8579-1	ADVISORY

JSON

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",
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          },
          {
            "binary_name": "ubuntu-core-launcher",
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          },
          {
            "binary_name": "ubuntu-core-snapd-units",
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          },
          {
            "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"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-8933 (GCVE-0-2026-8933)

FKIE_CVE-2026-8933

GHSA-FXQR-J4GX-622C

ubuntu-cve-2026-8933

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature