CVE-2021-0920
Android Kernel Race Condition Vulnerability
- Medium 6.4
- Exploited: added to CISA KEV 23 May 2022
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
Key facts
- Published
- 15 Dec 2021
- Last changed
- 21 Oct 2025
- Assigned by
- google_android
- KEV added
- 23 May 2022
- KEV fix due
- 13 Jun 2022
- EPSS
- 0.867% likely to be exploited in the next 30 days, higher than 59.285% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 6.4CVSS 3.1, Mediumfrom CISA (ADP container)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | Android |
|
Timeline
- 15 Dec 2021 Published
- 23 May 2022 CVE-2021-0920 added to CISA KEV
- 23 May 2022 Added to the CISA KEV catalogue