# CVE-2022-3910: linux: Use After Free vulnerability in Linux Kernel allows Privilege Escalation

CVE-2022-3910 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-3910, released November 22, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-3910
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0107
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 22, 2022

## 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.19.11-1 | [DEBIAN-CVE-2022-3910](https://patchblox.com/security/data/fix/linux/debian-cve-2022-3910.md) | Nov 22, 2022 |
| Linux | linux Debian 13.5 (trixie) | 5.19.11-1 | [DEBIAN-CVE-2022-3910](https://patchblox.com/security/data/fix/linux/debian-cve-2022-3910.md) | Nov 22, 2022 |
| Linux | linux Debian 14 | 5.19.11-1 | [DEBIAN-CVE-2022-3910](https://patchblox.com/security/data/fix/linux/debian-cve-2022-3910.md) | Nov 22, 2022 |

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