# CVE-2026-12391: ubuntu-advantage-pro: An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) w...

CVE-2026-12391 is fixed in 5 products on 1 platform, first by ubuntu-advantage-pro 37.2ubuntu0.1, released July 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-12391
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 17, 2026

## Description

An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ubuntu-advantage-pro Ubuntu 22.04.1 LTS (jammy) | 37.2ubuntu~22.04.1 | [ubuntu-advantage-pro 37.2ubuntu~22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-advantage-pro-37.2ubuntu-22.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-advantage-pro Ubuntu 24.04.5 LTS (noble) | 37.2ubuntu~24.04.1 | [ubuntu-advantage-pro 37.2ubuntu~24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-advantage-pro-37.2ubuntu-24.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-advantage-pro Ubuntu 26.04.1 LTS (resolute) | 37.2ubuntu0.1 | [ubuntu-advantage-pro 37.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ubuntu-advantage-pro-37.2ubuntu0.1.md) | Jul 17, 2026 |
| Linux | ubuntu-advantage-tools Ubuntu 22.04.1 LTS (jammy) | 37.2ubuntu~22.04.1 | [ubuntu-advantage-tools 37.2ubuntu~22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-advantage-tools-37.2ubuntu-22.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-advantage-tools Ubuntu 24.04.5 LTS (noble) | 37.2ubuntu~24.04.1 | [ubuntu-advantage-tools 37.2ubuntu~24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-advantage-tools-37.2ubuntu-24.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-advantage-tools Ubuntu 26.04.1 LTS (resolute) | 37.2ubuntu0.1 | [ubuntu-advantage-tools 37.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ubuntu-advantage-tools-37.2ubuntu0.1.md) | Jul 17, 2026 |
| Linux | ubuntu-pro-auto-attach Ubuntu 22.04.1 LTS (jammy) | 37.2ubuntu~22.04.1 | [ubuntu-pro-auto-attach 37.2ubuntu~22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-pro-auto-attach-37.2ubuntu-22.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-pro-auto-attach Ubuntu 24.04.5 LTS (noble) | 37.2ubuntu~24.04.1 | [ubuntu-pro-auto-attach 37.2ubuntu~24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-pro-auto-attach-37.2ubuntu-24.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-pro-auto-attach Ubuntu 26.04.1 LTS (resolute) | 37.2ubuntu0.1 | [ubuntu-pro-auto-attach 37.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ubuntu-pro-auto-attach-37.2ubuntu0.1.md) | Jul 17, 2026 |
| Linux | ubuntu-pro-client Ubuntu 22.04.1 LTS (jammy) | 37.2ubuntu~22.04.1 | [ubuntu-pro-client 37.2ubuntu~22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-pro-client-37.2ubuntu-22.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-pro-client Ubuntu 24.04.5 LTS (noble) | 37.2ubuntu~24.04.1 | [ubuntu-pro-client 37.2ubuntu~24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-pro-client-37.2ubuntu-24.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-pro-client Ubuntu 26.04.1 LTS (resolute) | 37.2ubuntu0.1 | [ubuntu-pro-client 37.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ubuntu-pro-client-37.2ubuntu0.1.md) | Jul 17, 2026 |
| Linux | ubuntu-pro-client-l10n Ubuntu 22.04.1 LTS (jammy) | 37.2ubuntu~22.04.1 | [ubuntu-pro-client-l10n 37.2ubuntu~22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-pro-client-l10n-37.2ubuntu-22.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-pro-client-l10n Ubuntu 24.04.5 LTS (noble) | 37.2ubuntu~24.04.1 | [ubuntu-pro-client-l10n 37.2ubuntu~24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-pro-client-l10n-37.2ubuntu-24.04.1.md) | Jul 18, 2026 |
| Linux | ubuntu-pro-client-l10n Ubuntu 26.04.1 LTS (resolute) | 37.2ubuntu0.1 | [ubuntu-pro-client-l10n 37.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ubuntu-pro-client-l10n-37.2ubuntu0.1.md) | Jul 17, 2026 |

---

Data as of 2026-11-09T07:25:28Z 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.