CVE DATABASE / CVE-2021-0920
CVE-2021-0920
Android Kernel Race Condition Vulnerability
Confirmed exploited in the wild. Added 2022-05-23.
Federal remediation due 2022-06-13.
Required action: Apply updates per vendor instructions.
Summary
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
CVSS 3.1 breakdown
| Base score | 6.4 (MEDIUM) |
| Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | HIGH |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
- https://source.android.com/security/bulletin/2021-11-01
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-23. Always verify against the vendor advisory before acting.