Google Android Kernel race condition

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Google Android. It has been rated as problematic. This affects an unknown part of the component Kernel. The manipulation leads to an unknown weakness. This vulnerability is documented as CVE-2021-0920. Additionally, an exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Google Android (Smartphone Operating System) (version unknown). This issue affects an unknown function of the component Kernel. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. The impact remains unknown. The summary by CVE is:

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

The weakness was released 11/01/2021 as A-196926917. The advisory is shared at source.android.com. The identification of this vulnerability is CVE-2021-0920. Technical details are unknown but an exploit is available.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 244209 (Linux Distros Unpatched Vulnerability : CVE-2021-0920), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 05/23/2022 with a due date of 06/13/2022:

Apply updates per vendor instructions.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (244209). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.4
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 244209
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-0920

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

11/06/2020 🔍
11/01/2021 +360 days 🔍
11/01/2021 +0 days 🔍
11/06/2021 +5 days 🔍
08/07/2025 +1370 days 🔍

Sourcesinfo

Vendor: google.com

Advisory: A-196926917
Status: Confirmed

CVE: CVE-2021-0920 (🔍)
GCVE (CVE): GCVE-0-2021-0920
GCVE (VulDB): GCVE-100-186221
scip Labs: https://www.scip.ch/en/?labs.20150917

Entryinfo

Created: 11/06/2021 23:29
Updated: 08/07/2025 13:47
Changes: 11/06/2021 23:29 (38), 11/10/2021 15:19 (1), 04/26/2024 08:58 (26), 09/22/2024 23:32 (1), 04/04/2025 20:21 (22), 08/07/2025 13:47 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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