CVE-2021-39802 Privilege escalation in Android
A local attacker can escalate privileges by exploiting a permissions bypass in the Android kernel's mprotect function to make shared memory writable.
- 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-2021-39802?
CVE-2021-39802 is a high-severity vulnerability in Google Android, published on 12 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In change_pte_range of mprotect.c , there is a possible way to make a shared mmap writable due to a permissions bypass. 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-213339151References: Upstream kernel
Weakness: CWE-863
Which versions are affected by CVE-2021-39802?
It affects 1 product.
Products include Google Android.
How do I fix CVE-2021-39802?
Apply the vendor's patch.
Is CVE-2021-39802 being exploited?
There is no known exploitation of CVE-2021-39802 in the wild and no public exploit code.
Other vulnerabilities in Google Android
Sources
Also known as A-213339151, ASB-A-213339151, GHSA-pw5p-gx3j-x3xv, UBUNTU-CVE-2021-39802.