Vulnerability identifier: #VU61997

Vulnerability risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39801

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

The vulnerability exists due to a use-after-free error in ION_IOC_ALLOC in Linux kernel. A local user can send a specially crafted IOCTL request, trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://source.android.com/security/bulletin/2022-04-01#details-05
http://android.googlesource.com/kernel/common/+/504e1d6ee65d5
http://android.googlesource.com/kernel/common/+/a8200613c8c9f
http://android.googlesource.com/kernel/common/+/c47385c73fced

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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.