FKIE_CVE-2026-8933

Vulnerability from fkie_nvd - Published: 2026-07-21 15:16 - Updated: 2026-07-21 20:25
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
security@ubuntu.comhttps://ubuntu.com/security/CVE-2026-8933
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/canonical",
          "defaultStatus": "unaffected",
          "packageName": "snapd",
          "repo": "https://github.com/canonical/snapd/",
          "versions": [
            {
              "lessThan": "2.76.1",
              "status": "affected",
              "version": "2.75.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://launchpad.net/ubuntu/resolute",
          "defaultStatus": "affected",
          "packageName": "snapd",
          "platforms": [
            "Linux"
          ],
          "product": "Ubuntu 26.04 LTS",
          "repo": "https://launchpad.net/ubuntu/+source/snapd",
          "vendor": "Canonical",
          "versions": [
            {
              "status": "unaffected",
              "version": "2.76+ubuntu26.04.3",
              "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": [
            {
              "status": "unaffected",
              "version": "2.76+ubuntu24.04.1",
              "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": [
            {
              "status": "unaffected",
              "version": "2.76+ubuntu22.04.1",
              "versionType": "dpkg"
            }
          ]
        }
      ],
      "source": "security@ubuntu.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-8933",
  "lastModified": "2026-07-21T20:25:45.920",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "security@ubuntu.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-21T15:16:39.563",
  "references": [
    {
      "source": "security@ubuntu.com",
      "url": "https://ubuntu.com/security/CVE-2026-8933"
    }
  ],
  "sourceIdentifier": "security@ubuntu.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-250"
        }
      ],
      "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.
  • 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.


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