CVE-2021-39656

CVSS V2 Medium 4.6 CVSS V3 Medium 6.7

Description

In __configfs_open_file of file.c, there is a possible use-after-free due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-174049066References: Upstream kernel

Overview

CVE ID
CVE-2021-39656

Assigner
security@android.com

Vulnerability Status
Analyzed

Published Version
2021-12-15T19:15:15

Last Modified Date
2021-12-20T22:16:25

Weakness Enumerations

CWE	URL
CWE-416	http://cwe.mitre.org/data/definitions/416.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:o:google:android:-:::::::*	1	OR

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:L/Au:N/C:P/I:P/A:P

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
PARTIAL

Integrity Impact
PARTIAL

Availability Impact
PARTIAL

Base Score
4.6

Severity
MEDIUM

Exploitability Score
3.9

Impact Score
6.4

CVSS Version 3

Version
3.1

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

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
HIGH

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
6.7

Base Severity
MEDIUM

Exploitability Score
0.8

Impact Score
5.9

References

Reference URL	Reference Tags
https://source.android.com/security/bulletin/pixel/2021-12-01	Patch Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-39656
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39656

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 06:40:36				Added to TrackCVE
2022-12-06 04:09:25	2021-12-15T19:15Z	2021-12-15T19:15:15	CVE Published Date	updated
2022-12-06 04:09:25		2021-12-20T22:16:25	CVE Modified Date	updated
2022-12-06 04:09:25		Analyzed	Vulnerability Status	updated