CVE-2023-21400 Race condition in Android

Medium 6.7 Published 12 Jul 2023 Updated 13 Feb 2025

A race condition in the Android kernel's io_uring subsystem allows local attackers with system privileges to escalate privileges via memory corruption.

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-2023-21400?

CVE-2023-21400 is a medium-severity vulnerability in Debian Debian Linux, published on 12 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In multiple functions of io_uring.c, there is a possible kernel memory corruption due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.

Weakness: CWE-667

Which versions are affected by CVE-2023-21400?

It affects 2 products.

Products include Debian Debian Linux, Google Android.

How do I fix CVE-2023-21400?

Apply the vendor's patch.

Is CVE-2023-21400 being exploited?

There is no known exploitation of CVE-2023-21400 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as A-264663832, DEBIAN-CVE-2023-21400, GHSA-xjm8-9w9g-9h2f, PUB-A-264663832, UBUNTU-CVE-2023-21400.