# CVE-2023-1872: linux: A use-after-free vulnerability in the Linux Kernel io_uring system can be exploited to achieve local privilege escala...

CVE-2023-1872 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-1872, released April 12, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-1872
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0031
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 12, 2023

## Description

A use-after-free vulnerability in the Linux Kernel io_uring system can be exploited to achieve local privilege escalation.  The io_file_get_fixed function lacks the presence of ctx->uring_lock which can lead to a Use-After-Free vulnerability due a race condition with fixed files getting unregistered.  We recommend upgrading past commit da24142b1ef9fd5d36b76e36bab328a5b27523e8.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2023-1872](https://patchblox.com/security/data/fix/linux/debian-cve-2023-1872.md) | Apr 12, 2023 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2023-1872](https://patchblox.com/security/data/fix/linux/debian-cve-2023-1872.md) | Apr 12, 2023 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2023-1872](https://patchblox.com/security/data/fix/linux/debian-cve-2023-1872.md) | Apr 12, 2023 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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