{
  "id": "CVE-2021-0920",
  "url": "https://spydr.io/cve/CVE-2021-0920",
  "published": "2021-12-15T19:15:11.017Z",
  "modified": "2026-06-17T03:30:39.430Z",
  "score": 6.4,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
  "score_source": "NVD",
  "epss": 0.0082,
  "epss_percentile": 0.55853,
  "exploited": true,
  "kev": {
    "added": "2022-05-23",
    "due": "2022-06-13",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Android Kernel Race Condition Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-0920"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "linux",
    "google",
    "debian"
  ],
  "products": [
    "Android"
  ],
  "cwes": [
    "CWE-362",
    "CWE-416"
  ],
  "description": "In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References: Upstream kernel",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 6.4,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://source.android.com/security/bulletin/2021-11-01",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-0920",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}