cve/2019/CVE-2019-9213.md

### [CVE-2019-9213](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9213)
![](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

In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

### POC

#### Reference
- http://packetstormsecurity.com/files/156053/Reliable-Datagram-Sockets-RDS-rds_atomic_free_op-Privilege-Escalation.html
- https://usn.ubuntu.com/3932-1/
- https://www.exploit-db.com/exploits/46502/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/HaleyWei/POC-available
- https://github.com/bsauce/kernel-exploit-factory
- https://github.com/bsauce/kernel-security-learning
- https://github.com/kdn111/linux-kernel-exploitation
- https://github.com/khanhdn111/linux-kernel-exploitation
- https://github.com/khanhdz-06/linux-kernel-exploitation
- https://github.com/khanhdz191/linux-kernel-exploitation
- https://github.com/khanhhdz/linux-kernel-exploitation
- https://github.com/khanhhdz06/linux-kernel-exploitation
- https://github.com/khanhnd123/linux-kernel-exploitation
- https://github.com/knd06/linux-kernel-exploitation
- https://github.com/lnick2023/nicenice
- https://github.com/ndk191/linux-kernel-exploitation
- https://github.com/qazbnm456/awesome-cve-poc
- https://github.com/shizhongpwn/Skr_StudyEveryday
- https://github.com/soh0ro0t/HappyHackingOnLinux
- https://github.com/ssr-111/linux-kernel-exploitation
- https://github.com/wkhnh06/linux-kernel-exploitation
- https://github.com/xairy/linux-kernel-exploitation
- https://github.com/xbl3/awesome-cve-poc_qazbnm456