cve/2019/CVE-2019-12819.md

### [CVE-2019-12819](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12819)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

An issue was discovered in the Linux kernel before 5.0. The function __mdiobus_register() in drivers/net/phy/mdio_bus.c calls put_device(), which will trigger a fixed_mdio_bus_init use-after-free. This will cause a denial of service.

### POC

#### Reference
- http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html
- https://usn.ubuntu.com/4118-1/

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