### [CVE-2025-21669](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-21669)
![](https://img.shields.io/static/v1?label=Product&message=Linux&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=5.5%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=blue)

### Description

In the Linux kernel, the following vulnerability has been resolved:vsock/virtio: discard packets if the transport changesIf the socket has been de-assigned or assigned to another transport,we must discard any packets received because they are not expectedand would cause issues when we access vsk->transport.A possible scenario is described by Hyunwoo Kim in the attached link,where after a first connect() interrupted by a signal, and a secondconnect() failed, we can find `vsk->transport` at NULL, leading to aNULL pointer dereference.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds
- https://github.com/w4zu/Debian_security
- https://github.com/xairy/linux-kernel-exploitation