cve/2016/CVE-2016-9644.md

### [CVE-2016-9644](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9644)
![](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

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application.  NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.

### POC

#### Reference
- http://www.ubuntu.com/usn/USN-3146-1
- http://www.ubuntu.com/usn/USN-3146-1

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