How severe is CVE-2021-0920?

CVE-2021-0920 has a CVSS 3.1 base score of 6.4 (MEDIUM). EPSS estimates a 0.8% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2021-0920: Android Kernel Race Condition

CISA Known Exploited Vulnerabilities

Android Kernel Race Condition Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-05-23

Remediation due

2022-06-13

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-0920

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

Severity

CVSS 3.1 · CISA6.4 MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
-	Android	Android kernel

References

2 Links

Mailing lists

[debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update

Other references

https://source.android.com/security/bulletin/2021-11-01

Record Details

Published

2021-12-15

Last updated

2025-10-21

Assigner (CNA)

google_android

Credited to

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.