Vulnerability-Lookup

GHSA-GRPW-JGRW-CCQR

Vulnerability from github – Published: 2026-03-17 15:36 – Updated: 2026-03-18 06:31

Details

Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS.

Severity ?

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-3888"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-268"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-17T14:16:17Z",
    "severity": "HIGH"
  },
  "details": "Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap\u0027s private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS.",
  "id": "GHSA-grpw-jgrw-ccqr",
  "modified": "2026-03-18T06:31:19Z",
  "published": "2026-03-17T15:36:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3888"
    },
    {
      "type": "WEB",
      "url": "https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root"
    },
    {
      "type": "WEB",
      "url": "https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt"
    },
    {
      "type": "WEB",
      "url": "https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2026-3888"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/notices/USN-8102-1"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/18/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-3888 (GCVE-0-2026-3888)

Vulnerability from cvelistv5 – Published: 2026-03-17 14:02 – Updated: 2026-03-18 08:59

Title

Local Privilege Escalation in snapd

Summary

Severity ?

7.8 (High)


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

CWE

CWE-268 - Privilege chaining

Assigner

canonical

References

URL

Tags

	https://ubuntu.com/security/CVE-2026-3888	vdb-entryissue-tracking
	https://ubuntu.com/security/notices/USN-8102-1	vendor-advisory
	https://discourse.ubuntu.com/t/snapd-local-privil…	technical-descriptionvendor-advisory
	https://blog.qualys.com/vulnerabilities-threat-re…	technical-descriptionmedia-coverage
	https://cdn2.qualys.com/advisory/2026/03/17/snap-…	technical-descriptionmedia-coverage

Impacted products

Vendor

Product

Version

Affected: 0 , < 2.75.1 (semver)

Canonical	Ubuntu 16.04 LTS	Unaffected: 2.61.4ubuntu0.16.04.1+esm2 , < * (dpkg)
Canonical	Ubuntu 18.04 LTS	Unaffected: 2.61.4ubuntu0.18.04.1+esm2 , < * (dpkg)
Canonical	Ubuntu 20.04 LTS	Unaffected: 2.67.1+20.04ubuntu1~esm1 , < * (dpkg)
Canonical	Ubuntu 22.04 LTS	Unaffected: 2.73+ubuntu22.04.1 , < * (dpkg)
Canonical	Ubuntu 24.04 LTS	Unaffected: 2.73+ubuntu24.04.2 , < * (dpkg)

Date Public ?

2026-03-17 14:00

Credits

Qualys Security Advisory Team

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-3888",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-17T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-18T03:55:45.787Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-18T03:02:10.640Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/18/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/canonical",
          "defaultStatus": "unaffected",
          "packageName": "snapd",
          "repo": "https://github.com/canonical/snapd/",
          "versions": [
            {
              "lessThan": "2.75.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/xenial",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
            "Linux"
          ],
          "product": "Ubuntu 16.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.61.4ubuntu0.16.04.1+esm2",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/bionic",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
            "Linux"
          ],
          "product": "Ubuntu 18.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.61.4ubuntu0.18.04.1+esm2",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/focal",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
            "Linux"
          ],
          "product": "Ubuntu 20.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.67.1+20.04ubuntu1~esm1",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/jammy",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
            "Linux"
          ],
          "product": "Ubuntu 22.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.73+ubuntu22.04.1",
              "versionType": "dpkg"
            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/noble",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
            "Linux"
          ],
          "product": "Ubuntu 24.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.73+ubuntu24.04.2",
              "versionType": "dpkg"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Qualys Security Advisory Team"
        }
      ],
      "datePublic": "2026-03-17T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap\u0027s private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-233",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-233 Privilege Escalation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-268",
              "description": "CWE-268 Privilege chaining",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-18T08:59:07.522Z",
        "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "shortName": "canonical"
      },
      "references": [
        {
          "tags": [
            "vdb-entry",
            "issue-tracking"
          ],
          "url": "https://ubuntu.com/security/CVE-2026-3888"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://ubuntu.com/security/notices/USN-8102-1"
        },
        {
          "tags": [
            "technical-description",
            "vendor-advisory"
          ],
          "url": "https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888"
        },
        {
          "tags": [
            "technical-description",
            "media-coverage"
          ],
          "url": "https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root"
        },
        {
          "tags": [
            "technical-description",
            "media-coverage"
          ],
          "url": "https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Local Privilege Escalation in snapd"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2026-3888",
    "datePublished": "2026-03-17T14:02:08.475Z",
    "dateReserved": "2026-03-10T16:03:08.583Z",
    "dateUpdated": "2026-03-18T08:59:07.522Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-GRPW-JGRW-CCQR

CVE-2026-3888 (GCVE-0-2026-3888)

Tags

Sightings

Nomenclature