cve/2015/CVE-2015-4170.md

### [CVE-2015-4170](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4170)
![](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

Race condition in the ldsem_cmpxchg function in drivers/tty/tty_ldsem.c in the Linux kernel before 3.13-rc4-next-20131218 allows local users to cause a denial of service (ldsem_down_read and ldsem_down_write deadlock) by establishing a new tty thread during shutdown of a previous tty thread.

### POC

#### Reference
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- https://www.kernel.org/pub/linux/kernel/next/patch-v3.13-rc4-next-20131218.xz

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