Android Kernel Race Condition Vulnerability

MEDIUM 6.4EXPLOITED (CISA KEV)CVE-2021-0920 · Published 15/12/2021 · updated 17/06/2026

Android Kernel Race Condition Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 23/05/2022. Patch affected systems as an emergency.

In short

CVE-2021-0920 is a MEDIUM (CVSS 6.4) vulnerability.
Exploited in the wild: CISA added it to the KEV catalog on 23/05/2022.
Chance of exploitation in the next 30 days (EPSS): 0.87%, higher than 58.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
Kernel Android	Versions not published yet (product named by CISA KEV)

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

References

lists.debian.org/debian-lts-announce/2021/12/msg00012.html · Mailing List
source.android.com/security/bulletin/2021-11-01 · Vendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · Third Party Advisory
CISA KEV · CVE-2021-0920

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