### [CVE-2016-6516](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6516)
![](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 ioctl_file_dedupe_range function in fs/ioctl.c in the Linux kernel through 4.7 allows local users to cause a denial of service (heap-based buffer overflow) or possibly gain privileges by changing a certain count value, aka a "double fetch" vulnerability.

### POC

#### Reference
- http://www.openwall.com/lists/oss-security/2016/07/31/6

#### Github
- https://github.com/mudongliang/LinuxFlaw
- https://github.com/oneoy/cve-
- https://github.com/wpengfei/CVE-2016-6516-exploit