# CVE-2018-6557: base-files: The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10...

CVE-2018-6557 is fixed in base-files on 1 platform by base-files 10.1ubuntu2.2 (version 10.1ubuntu2.2), released August 20, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-6557
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 20, 2018

## Description

The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | base-files Ubuntu 18.04.6 LTS (bionic) | 10.1ubuntu2.2 | [base-files 10.1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-base-files-10.1ubuntu2.2.md) | Aug 20, 2018 |

---

Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo