CVE-2021-39733 Memory corruption in Android
A local attacker with system privileges can exploit an out-of-bounds write in the Android kernel audio driver to escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39733?
CVE-2021-39733 is a medium-severity memory corruption vulnerability in Google Android, published on 16 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In amcs_cdev_unlocked_ioctl of audiometrics.c, there is a possible out of bounds write due to improper input validation. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-206128522References: N/A
Weakness: CWE-787
Which versions are affected by CVE-2021-39733?
It affects 1 product.
Products include Google Android.
How do I fix CVE-2021-39733?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-39733 being exploited?
There is no known exploitation of CVE-2021-39733 in the wild and no public exploit code.
Other vulnerabilities in Google Android
Sources
Also known as A-206128522, GHSA-367v-pv48-64fx, PUB-A-206128522.