CVE-2021-0920Android Kernel Race Condition Vulnerability

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

6.4 MEDIUMEPSS 0.86%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:30 UTC

OverviewCVSS details

6.4MEDIUMCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Dec 15, 2021
Assigner: google_android

Affected

Android

Versions: Android kernel

Exploitation

Public exploit: None listed
CISA KEV: Listed · May 23, 2022
KEV due date: Jun 13, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

0.86%chance of exploitation in 30 days

Higher than 58.96% of CVEs

CVSS 3.1 · NVD

6.4Medium

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

Attack vector: Local
Attack complexity: High
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

6.9Medium

AV:L/AC:M/Au:N/C:C/I:C/A:C

Attack vector: Local
Attack complexity: Medium
Authentication: None
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
6.4	MEDIUM	3.1NVD	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.9	MEDIUM	2.0NVD	AV:L/AC:M/Au:N/C:C/I:C/A:C

CISA required action

⚡ Known exploited · remediation due Jun 13, 2022

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Details

CVE ID: CVE-2021-0920
Status: Analyzed
Assigner (CNA): google_android
Published: Dec 15, 2021
Last modified: 2026-06-17 03:30 UTC
Weaknesses: CWE-362
CWE-416

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 14:06 UTC.