Canonical ubuntu-pro-client 16.04 LTS up to 24.04 LTS Log Collection Framework information disclosure

Summaryinfo

A vulnerability was found in Canonical ubuntu-pro-client 16.04 LTS up to 24.04 LTS. It has been classified as problematic. The affected element is an unknown function of the component Log Collection Framework. The manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-2026-12391. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Canonical ubuntu-pro-client 16.04 LTS up to 24.04 LTS and classified as problematic. This issue affects an unknown code block of the component Log Collection Framework. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

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.

The advisory is shared at ubuntu.com. The identification of this vulnerability is CVE-2026-12391 since 06/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-44912). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Canonical

Name

• ubuntu-pro-client

Version

• 16.04 LTS
• 18.04 LTS
• 20.04 LTS
• 22.04 LTS
• 24.04 LTS
• 26.04 LTS

License

• open-source

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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