# CVE-2021-0920: Android Kernel Race Condition Vulnerability

> CVE-2021-0920: Android Kernel Race Condition Vulnerability. CVSS 6.4 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-0920
Last updated: 2025-10-21T23:15:50Z

- Published: 2021-12-15 18:05 UTC · Updated: 2025-10-21 23:15 UTC · Assigner: google\_android
- CVSS: 6.4 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.87%, 58th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-23, federal due date 2022-06-13, ransomware use: Unknown

## 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

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- n/a: Android

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-0920)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-0920)
- [https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html](https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html)
- [https://source.android.com/security/bulletin/2021-11-01](https://source.android.com/security/bulletin/2021-11-01)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-0920 · Markdown: https://rewindex.com/cve/CVE-2021-0920.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-0920 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:56.076Z