#VU61097 Use-after-free in Google Android - CVE-2021-39698

Vulnerability identifier: #VU61097

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-2021-39698

CWE-ID: CWE-416

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 use-after-free error in Linux kernel. A local user can run a specially crafted program to trigger the use-after-free error and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Google Android: 10 2020-12-05 - 12

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External links
http://source.android.com/security/bulletin/2022-03-01#details-05
http://android.googlesource.com/kernel/common/+/42288cb44c4b
http://android.googlesource.com/kernel/common/+/a880b28a71e3
http://android.googlesource.com/kernel/common/+/9537bae0da1f
http://android.googlesource.com/kernel/common/+/363bee27e258
http://android.googlesource.com/kernel/common/+/50252e4b5e98

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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.