cve/2023/CVE-2023-6817.md

### [CVE-2023-6817](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6817)
![](https://img.shields.io/static/v1?label=Product&message=Kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=5.6%3C%206.7%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-416%20Use%20After%20Free&color=brighgreen)

### Description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free.We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.

### POC

#### Reference
- http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html
- http://www.openwall.com/lists/oss-security/2023/12/22/6

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