cve/2023/CVE-2023-6546.md

### [CVE-2023-6546](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6546)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%206&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%207&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%208&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%208.6%20Extended%20Update%20Support&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%208.8%20Extended%20Update%20Support&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%209&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%209.0%20Extended%20Update%20Support&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%209.2%20Extended%20Update%20Support&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Virtualization%204%20for%20Red%20Hat%20Enterprise%20Linux%208&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use%20After%20Free&color=brighgreen)

### Description

A race condition was found in the GSM 0710 tty multiplexor in the Linux kernel. This issue occurs when two threads execute the GSMIOC_SETCONF ioctl on the same tty file descriptor with the gsm line discipline enabled, and can lead to a use-after-free problem on a struct gsm_dlci while restarting the gsm mux. This could allow a local unprivileged user to escalate their privileges on the system.

### POC

#### Reference
- http://www.openwall.com/lists/oss-security/2024/04/10/18
- http://www.openwall.com/lists/oss-security/2024/04/10/21
- http://www.openwall.com/lists/oss-security/2024/04/11/7
- http://www.openwall.com/lists/oss-security/2024/04/11/9
- http://www.openwall.com/lists/oss-security/2024/04/16/2
- http://www.openwall.com/lists/oss-security/2024/04/17/1

#### Github
- https://github.com/Nassim-Asrir/ZDI-24-020
- https://github.com/fkie-cad/nvd-json-data-feeds
- https://github.com/marklogic/marklogic-docker
- https://github.com/xairy/linux-kernel-exploitation