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

Source: https://junglewise.ai/threats/cve-2021-0920-android-kernel-race-condition-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-23. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-0920 · Severity: critical · CVSS 6.4 · Exploited in the wild · Published 2022-05-23

A race condition in the unix_scm_to_skb function of af_unix.c in the Linux kernel leads to a use-after-free vulnerability. This flaw allows a local attacker with System execution privileges to escalate their privileges on Android devices.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux).

## Quick answers

**Is CVE-2021-0920 exploited in the wild?** Yes. CVE-2021-0920 is known to be exploited in the wild, first recorded on 23 May 2022. Treat it as urgent.

**How severe is CVE-2021-0920?** Critical severity, with a CVSS score of 6.4, published 23 May 2022.

**Which products and versions are affected?** Google Android Kernel up to 5.13; Google Android; Debian Debian Linux 9.0.

**Is there a fix for CVE-2021-0920?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-0920 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2021-0920?** Check whether you run Linux Kernel. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Google Android Kernel up to 5.13
- Google Android
- Debian Debian Linux 9.0

## Timeline

- 2021-11-01: advisory: Android Security Bulletin published
- 2021-12-15: disclosed: NVD Published Date
- 2022-05-23: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2022-05-23: other: Published date listed in advisory summary

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