cve/2024/CVE-2024-38570.md

### [CVE-2024-38570](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38570)
![](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=3.8%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=fb6791d100d1bba20b5cdbc4912e1f7086ec60f8%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:gfs2: Fix potential glock use-after-free on unmountWhen a DLM lockspace is released and there ares still locks in thatlockspace, DLM will unlock those locks automatically.  Commitfb6791d100d1b started exploiting this behavior to speed up filesystemunmount: gfs2 would simply free glocks it didn't want to unlock and thenrelease the lockspace.  This didn't take the bast callbacks forasynchronous lock contention notifications into account, which remainactive until until a lock is unlocked or its lockspace is released.To prevent those callbacks from accessing deallocated objects, put theglocks that should not be unlocked on the sd_dead_glocks list, releasethe lockspace, and only then free those glocks.As an additional measure, ignore unexpected ast and bast callbacks ifthe receiving glock is dead.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/bygregonline/devsec-fastapi-report
- https://github.com/robertsirc/sle-bci-demo