cve/2023/CVE-2023-2236.md

### [CVE-2023-2236](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2236)
![](https://img.shields.io/static/v1?label=Product&message=Linux%20Kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=5.19%3C%206.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-416%20Use%20After%20Free&color=brighgreen)

### Description

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

### POC

#### Reference
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4

#### Github
No PoCs found on GitHub currently.