CVE-2021-0920: Android Kernel Race Condition Vulnerability

Medium severity, CVSS 6.4. Actively exploited: in CISA KEV since 2022-05-23. EPSS: 0.9% chance of exploitation in the next 30 days.

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 products

• Debian Debian Linux: version 9.0 only
• Google Android: affected versions not specified
• Linux Linux Kernel: up to and including 5.13; version 5.14 only

Published 2021-12-15. Last modified 2026-06-17.