FKIE_CVE-2026-3888

Vulnerability from fkie_nvd - Published: 2026-03-17 14:16 - Updated: 2026-06-17 10:44
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
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.
References
security@ubuntu.comhttps://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-rootMitigation, Third Party Advisory
security@ubuntu.comhttps://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txtThird Party Advisory
security@ubuntu.comhttps://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888Mitigation, Third Party Advisory
security@ubuntu.comhttps://ubuntu.com/security/CVE-2026-3888Third Party Advisory
security@ubuntu.comhttps://ubuntu.com/security/notices/USN-8102-1Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/03/18/1Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
canonical ubuntu_linux 16.04
canonical ubuntu_linux 18.04
canonical ubuntu_linux 20.04
canonical ubuntu_linux 22.04
canonical ubuntu_linux 24.04
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "security@ubuntu.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
              "matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
              "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*",
              "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:*",
              "matchCriteriaId": "359012F1-2C63-415A-88B8-6726A87830DE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*",
              "matchCriteriaId": "BF90B5A4-6E55-4369-B9D4-E7A061E797D2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    },
    {
      "lang": "es",
      "value": "La escalada de privilegios local en snapd en Linux permite a los atacantes locales obtener privilegios de root al recrear el directorio /tmp privado de snap cuando systemd-tmpfiles est\u00e1 configurado para limpiar autom\u00e1ticamente este directorio. Este problema afecta a Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS y 24.04 LTS."
    }
  ],
  "id": "CVE-2026-3888",
  "lastModified": "2026-06-17T10:44:23.017",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.1,
        "impactScore": 6.0,
        "source": "security@ubuntu.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-3888",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-17T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-17T14:16:17.410",
  "references": [
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root"
    },
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt"
    },
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888"
    },
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://ubuntu.com/security/CVE-2026-3888"
    },
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://ubuntu.com/security/notices/USN-8102-1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/03/18/1"
    }
  ],
  "sourceIdentifier": "security@ubuntu.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-268"
        }
      ],
      "source": "security@ubuntu.com",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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