Vulnerability-Lookup

CVE-2026-15226 (GCVE-0-2026-15226)

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

Title

snapd snap-confine Sandbox Confinement Bypass via Omission of setuid Restriction in Seccomp Templates

Summary

A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes. Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes.

Severity

8.4 (High)


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

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-2026-15226	vdb-entryissue-tracking

Impacted products

7 products

Vendor	Product	Version
		Affected: 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)
Canonical	Ubuntu 20.04 LTS	Unaffected: 2.67.1+20.04ubuntu1~esm2 (dpkg)
Canonical	Ubuntu 18.04 LTS	Unaffected: 2.61.4ubuntu0.18.04.1+esm3 (dpkg)
Canonical	Ubuntu 16.04 LTS	Unaffected: 2.61.4ubuntu0.16.04.1+esm3

Date Public

2026-07-21 14:00

Credits

Zygmunt Krynicki

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-15226

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

Severity

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

Summary

References

	URL	Tags
	security@ubuntu.com	https://ubuntu.com/security/CVE-2026-15226

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "lang": "en",
      "value": "A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes.  Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes."
    }
  ],
  "id": "CVE-2026-15226",
  "lastModified": "2026-07-22T19:16:54.937",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 5.8,
        "source": "security@ubuntu.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-15226",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-22T18:15:09.916257Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-21T15:16:31.030",
  "references": [
    {
      "source": "security@ubuntu.com",
      "url": "https://ubuntu.com/security/CVE-2026-15226"
    }
  ],
  "sourceIdentifier": "security@ubuntu.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-250"
        }
      ],
      "source": "security@ubuntu.com",
      "type": "Secondary"
    }
  ]
}

GHSA-9PJ8-7M3M-MH5H

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

Details

Severity

8.4 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-15226"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-250"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T15:16:31Z",
    "severity": "HIGH"
  },
  "details": "A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes.  Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes.",
  "id": "GHSA-9pj8-7m3m-mh5h",
  "modified": "2026-07-21T15:30:44Z",
  "published": "2026-07-21T15:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15226"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2026-15226"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-15226

Vulnerability from osv_ubuntu

Published

2026-07-21 14:00

Modified

2026-07-21 21:01

Summary

Details

Severity

8.4 (High)


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

N/A (UNKNOWN)


                    
                      high

References

URL

Type

	https://ubuntu.com/security/CVE-2026-15226	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-15226	REPORT
	https://ubuntu.com/security/notices/USN-8579-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
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          },
          {
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            "binary_name": "snapd-xdg-open",
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          {
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          },
          {
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          }
        ],
        "priority_reason": "CVSS high"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.61.4ubuntu0.16.04.1+esm4?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
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    {
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        ],
        "priority_reason": "CVSS high"
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      "package": {
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        "name": "snapd",
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          {
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        "priority_reason": "CVSS high"
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      "package": {
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        "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 sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes. Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes.",
  "id": "UBUNTU-CVE-2026-15226",
  "modified": "2026-07-21T21:01:23Z",
  "published": "2026-07-21T14:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15226"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-15226"
    },
    {
      "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:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-15226"
  ]
}

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-2026-15226 (GCVE-0-2026-15226)

FKIE_CVE-2026-15226

GHSA-9PJ8-7M3M-MH5H

ubuntu-cve-2026-15226

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature