# CVE-2023-2236: linux: A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege esc...

CVE-2023-2236 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-2236, released May 1, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-2236
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2023

## Description

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.  Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.  We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.12-1 | [DEBIAN-CVE-2023-2236](https://patchblox.com/security/data/fix/linux/debian-cve-2023-2236.md) | May 1, 2023 |
| Linux | linux Debian 13.5 (trixie) | 6.0.12-1 | [DEBIAN-CVE-2023-2236](https://patchblox.com/security/data/fix/linux/debian-cve-2023-2236.md) | May 1, 2023 |
| Linux | linux Debian 14 | 6.0.12-1 | [DEBIAN-CVE-2023-2236](https://patchblox.com/security/data/fix/linux/debian-cve-2023-2236.md) | May 1, 2023 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.