#VU61096 Race condition in Google Android - CVE-2021-39686

Vulnerability identifier: #VU61096

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-39686

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Google Android
Operating systems & Components / Operating system

Vendor: Google

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in the binder implementation in Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Google Android: 10 2020-12-05 - 12

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External links
https://source.android.com/security/bulletin/2022-03-01#details-05
https://android.googlesource.com/kernel/common/+/d49297739550
https://android.googlesource.com/kernel/common/+/3af7a2f61023
https://android.googlesource.com/kernel/common/+/11db2de0af2a
https://android.googlesource.com/kernel/common/+/a4eacf3227bd

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.