CVE-2021-0920
KEVAndroid Kernel Race Condition Vulnerability
Description
Android kernel contains a race condition, which allows for a use-after-free vulnerability. Exploitation can allow for privilege escalation.
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 vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:HPublishedDec 15, 2021
Last modifiedJun 17, 2026
Added to KEVMay 23, 2022
Remediation dueJun 13, 2022
References
- lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing ListThird Party Advisory
- source.android.com/security/bulletin/2021-11-01Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-0920Third Party AdvisoryUS Government Resource
0 recent articles mention this CVE
62
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1596 days
- CVSS
- 6.4 MEDIUM
- EPSS (30-day exploit probability)
- 0.87% · top 42% of all CVEs
- Weakness
- CWE-362
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.