{"id":"CVE-2021-0920","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-0920","generatedAt":"2026-10-31T14:05:48.080Z","title":"Android Kernel Race Condition Vulnerability","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","published":"2021-12-15T19:15:11.000Z","lastModified":"2026-06-17T03:30:39.000Z","status":"Analyzed","sourceIdentifier":"security@android.com","cvss":{"version":"3.1","score":6.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-362","CWE-416"],"affected":["linux/linux kernel","google/android","debian/debian linux"],"epss":{"score":0.00867,"percentile":0.58702,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2022-05-23","dueDate":"2022-06-13","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-0920"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html","tags":["Mailing List","Third Party Advisory"],"source":"security@android.com"},{"url":"https://source.android.com/security/bulletin/2021-11-01","tags":["Vendor Advisory"],"source":"security@android.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://source.android.com/security/bulletin/2021-11-01","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920","tags":["Third Party Advisory","US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-0920","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}