CVE-2021-39681 Use after free in Android
A use-after-free flaw in the Android kernel allows local attackers to execute arbitrary code and escalate privileges without user interaction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39681?
CVE-2021-39681 is a high-severity use after free vulnerability in Google Android, published on 14 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In delete_protocol of main.c, there is a possible arbitrary code execution due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-200251074References: N/A
Weakness: CWE-416
Which versions are affected by CVE-2021-39681?
It affects 1 product.
Products include Google Android.
How do I fix CVE-2021-39681?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-39681 being exploited?
There is no known exploitation of CVE-2021-39681 in the wild and no public exploit code.
Other vulnerabilities in Google Android
Sources
Also known as A-200251074, GHSA-f55c-c9jm-8544, PUB-A-200251074.