{"id":"CVE-2021-0920","state":"PUBLISHED","title":"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 n","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","publishedAt":"2021-12-15T18:05:31.000Z","updatedAt":"2025-10-21T23:15:50.498Z","severity":{"score":6.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"google_android","products":["n/a Android"],"affected":[{"vendor":"n/a","product":"Android","versions":[{"version":"Android kernel","status":"affected"}]}],"references":["https://source.android.com/security/bulletin/2021-11-01","https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T19:47:50.134Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/0xxx/CVE-2021-0920.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-0920","state":"PUBLISHED","datePublished":"2021-12-15T18:05:31.000Z","dateUpdated":"2025-10-21T23:15:50.498Z","assignerShortName":"google_android","assignerOrgId":"baff130e-b8d5-4e15-b3d3-c3cf5d5545c6","dateReserved":"2020-11-06T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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"}],"affected":[{"vendor":"n/a","product":"Android","versions":[{"version":"Android kernel","status":"affected"}]}],"references":[{"url":"https://source.android.com/security/bulletin/2021-11-01","tags":["x_refsource_MISC"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html","name":"[debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update","tags":["mailing-list","x_refsource_MLIST"]}],"problemTypes":[{"descriptions":[{"description":"Elevation of privilege","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"google_android","dateUpdated":"2021-12-17T00:06:43.000Z","orgId":"baff130e-b8d5-4e15-b3d3-c3cf5d5545c6"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@android.com","ID":"CVE-2021-0920","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Android","version":{"version_data":[{"version_value":"Android kernel"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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"}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Elevation of privilege"}]}]},"references":{"reference_data":[{"name":"https://source.android.com/security/bulletin/2021-11-01","refsource":"MISC","url":"https://source.android.com/security/bulletin/2021-11-01"},{"name":"[debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update","refsource":"MLIST","url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://source.android.com/security/bulletin/2021-11-01","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html","name":"[debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update","tags":["mailing-list","x_refsource_MLIST","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:55:16.898Z"}},{"title":"CISA ADP Vulnrichment","references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920","tags":["government-resource"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.4,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"HIGH","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2021-0920","role":"CISA Coordinator","options":[{"Exploitation":"active"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2024-02-06T16:18:51.272894Z"}}},{"other":{"type":"kev","content":{"dateAdded":"2022-05-23","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-21T23:15:50.498Z"},"timeline":[{"time":"2022-05-23T00:00:00.000Z","lang":"en","value":"CVE-2021-0920 added to CISA KEV"}]}]}}}