CVE-2026-12391: ubuntu-pro-client Local Privilege Escalation and Information Disclosure via Symlink Arbitrary File Read in collect-logs
Canonical · ubuntu-pro-client (ubuntu-advantage-tools)
Vendor fix available · Affected: Canonical ubuntu-pro-client (ubuntu-advantage-tools) · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 10% of scored CVEs
DescriptionCVE.org
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.
Affected products7
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Canonical · ubuntu-pro-client (ubuntu-advantage-tools)before 37.3
- Canonical · Ubuntu 26.04 LTSVersions not stated
- Canonical · Ubuntu 24.04 LTSVersions not stated
- Canonical · Ubuntu 22.04 LTSVersions not stated
- Canonical · Ubuntu 20.04 LTSVersions not stated
- Canonical · Ubuntu 18.04 LTSVersions not stated
- Canonical · Ubuntu 16.04 LTSVersions not stated
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-12391 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.