PT-2021-22699 · Google · Android Kernel

Published 2021-12-15 · Updated 2021-12-31 · CVE-2021-39656

Positive Technologies (AI Summary)

CVSS v3.1

6.7

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Android kernel versions (affected versions not specified)

Description: The issue is related to a possible use-after-free due to improper locking in the configfs open file function of file.c. This could lead to local escalation of privilege in the kernel, requiring System execution privileges. No user interaction is needed for exploitation.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Locking

Use After Free

Weakness Enumeration

CWE-667

CWE-416

Related Identifiers

CVE-2021-39656

OESA-2021-1475

Affected Products

Android Kernel

References · 21

• https://osv.dev/vulnerability/UBUNTU-CVE-2021-39656 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-39656 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-25211 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-39656 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-4149 · Security Note
• https://osv.dev/vulnerability/OESA-2021-1475 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-39656 · Security Note
• https://ubuntu.com/security/CVE-2021-39656 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-4002 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-45095 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-39656 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-4037 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-39685 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-0920 · Security Note
• https://source.android.com/security/bulletin/pixel/2021-12-01 · Vendor Advisory