cve/2021/CVE-2021-3573.md

### [CVE-2021-3573](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3573)
![](https://img.shields.io/static/v1?label=Product&message=kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-362-%3ECWE-416&color=brighgreen)

### Description

A use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system. This flaw affects the Linux kernel versions prior to 5.13-rc5.

### POC

#### Reference
- http://www.openwall.com/lists/oss-security/2023/07/02/1
- https://www.openwall.com/lists/oss-security/2021/06/08/2

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/hardenedvault/ved
- 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/ndk191/linux-kernel-exploitation
- https://github.com/ssr-111/linux-kernel-exploitation
- https://github.com/xairy/linux-kernel-exploitation