# CVE-2023-24626: screen: socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux an...

CVE-2023-24626 is fixed in 3 products on 1 platform, first by screen 4.6.2-1ubuntu1.1+esm1, released April 7, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-24626
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 7, 2023

## Description

socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | screen Debian 13.5 (trixie) | 4.9.1-1 | [DEBIAN-CVE-2023-24626](https://patchblox.com/security/data/fix/linux/debian-cve-2023-24626.md) | Apr 8, 2023 |
| Linux | screen Debian 14 | 4.9.1-1 | [DEBIAN-CVE-2023-24626](https://patchblox.com/security/data/fix/linux/debian-cve-2023-24626.md) | Apr 8, 2023 |
| Linux | screen Ubuntu 18.04.6 LTS (bionic) | 4.6.2-1ubuntu1.1+esm1 | [screen 4.6.2-1ubuntu1.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-screen-4.6.2-1ubuntu1.1-esm1.md) | Apr 7, 2023 |
| Linux | screen Ubuntu 22.04.1 LTS (jammy) | 4.9.0-1ubuntu0.1 | [screen 4.9.0-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-screen-4.9.0-1ubuntu0.1.md) | May 7, 2025 |
| Linux | screen amzn 2023 | 4.8.0-5.amzn2023.0.3 | [ALAS2023-2023-224](https://patchblox.com/security/data/fix/linux/alas2023-2023-224.md) | Jun 21, 2023 |
| Linux | screen-debuginfo amzn 2023 | 4.8.0-5.amzn2023.0.3 | [ALAS2023-2023-224](https://patchblox.com/security/data/fix/linux/alas2023-2023-224.md) | Jun 21, 2023 |
| Linux | screen-debugsource amzn 2023 | 4.8.0-5.amzn2023.0.3 | [ALAS2023-2023-224](https://patchblox.com/security/data/fix/linux/alas2023-2023-224.md) | Jun 21, 2023 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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