CVE-2021-0941 Use after free in Android
A use-after-free in the Android kernel's BPF filter allows local attackers with system privileges 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-2021-0941?
CVE-2021-0941 is a medium-severity use after free vulnerability in Google Android, published on 25 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In bpf_skb_change_head of filter.c, there is a possible out of bounds read due to a use after free. 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-154177719References: Upstream kernel
Which versions are affected by CVE-2021-0941?
It affects 1 product.
Products include Google Android.
How do I fix CVE-2021-0941?
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-2021-0941 being exploited?
There is no known exploitation of CVE-2021-0941 in the wild and no public exploit code.
Other vulnerabilities in Google Android
Sources
Also known as A-154177719, DEBIAN-CVE-2021-0941, GHSA-c5v3-wvrc-wjc5, PUB-A-154177719, UBUNTU-CVE-2021-0941.