cve/2019/CVE-2019-18885.md

### [CVE-2019-18885](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18885)
![](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

fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka CID-09ba3bc9dd15.

### POC

#### Reference
- http://packetstormsecurity.com/files/156185/Kernel-Live-Patch-Security-Notice-LSN-0062-1.html
- https://github.com/bobfuzzer/CVE-2019-18885
- https://usn.ubuntu.com/4287-2/
- https://www.oracle.com/security-alerts/cpuApr2021.html

#### Github
- https://github.com/0xT11/CVE-POC
- https://github.com/developer3000S/PoC-in-GitHub
- https://github.com/hectorgie/PoC-in-GitHub