What is CVE-2021-0920?

CVE-2021-0920 is a medium-severity vulnerability in Google Android, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.4/10. Published 2021-12-15.

How severe is CVE-2021-0920?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Is CVE-2021-0920 known to be exploited?

Yes. CVE-2021-0920 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.

Use After Free in Google Android

CVE-2021-0920

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.Prod…

Vulnerability class: Race Condition

EPSS: 0.008 (52.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Google Android
Linux Linux_kernel — versions 5.14
Debian Debian_linux — versions 9.0
N/a Android — versions Android kernel

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-23. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-06-13.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

security@android.com (x_refsource_MISC, Vendor Advisory)
security@android.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory, US Government Resource)

Frequently asked questions

What is CVE-2021-0920?: CVE-2021-0920 is a medium-severity vulnerability in Google Android, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.4/10. Published 2021-12-15.
How severe is CVE-2021-0920?: Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2021-0920 known to be exploited?: Yes. CVE-2021-0920 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.