CVE-2022-3910 PoC — Use after free in IO_uring in the Linux Kernel

Source

https://github.com/veritas501/CVE-2022-3910

Associated Vulnerability

Title: Use after free in IO_uring in the Linux Kernel (CVE-2022-3910)
Description:Use After Free vulnerability in Linux Kernel allows Privilege Escalation. An improper Update of Reference Count in io_uring leads to Use-After-Free and Local Privilege Escalation. When io_msg_ring was invoked with a fixed file, it called io_fput_file() which improperly decreased its reference count (leading to Use-After-Free and Local Privilege Escalation). Fixed files are permanently registered to the ring, and should not be put separately. We recommend upgrading past commit https://github.com/torvalds/linux/commit/fc7222c3a9f56271fba02aabbfbae999042f1679 https://github.com/torvalds/linux/commit/fc7222c3a9f56271fba02aabbfbae999042f1679

Description

CVE-2022-3910

Readme

# CVE-2022-3910

- poc

![](assets/poc_success.png)

- dirtyfile

![](assets/dirtyfile_success.png)

![](assets/ubuntu_dirtyfile_success.png)

- dirtymm

![](assets/dirtymm_success.png)

![](assets/ubuntu_dirtymm_success.png)

File Snapshot

Remarks

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