cve/2019/CVE-2019-3901.md

### [CVE-2019-3901](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3901)
![](https://img.shields.io/static/v1?label=Product&message=kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20older%20then%204.8%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-667&color=brighgreen)

### Description

A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon