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CVE-2026-12391VulnerabilityPublished

ubuntu-advantage-tools · Insecure Symlink Following Vulnerability Exists

Affects ubuntu-advantage-toolsSource GCVE Database

0
Authoritative record:CVE-2026-12391· Medium 5.0

Not known to be exploited · CVSS 5.0 Medium · fixed in Ubuntu package updates : update the Ubuntu ubuntu-advantage-tools package when convenient.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
5.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 37.2ubuntu~22.04.1, 37.2ubuntu~24.04.1, 37.2ubuntu0.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade the Ubuntu ubuntu-advantage-tools to 37.2ubuntu~22.04.1 (package) or 37.2ubuntu~24.04.1 (package) or 37.2ubuntu0.1 (package).

Affected software

ProductAffectedFixed in
Ubuntu 26.04 LTSubuntu-advantage-toolspkg:deb/ubuntu/ubuntu-advantage-tools?arch=source&distro=resoluteOther threatsAffected
  • <37.2ubuntu0.1
  • =37ubuntu0
Fixed in
  • 37.2ubuntu0.1
Ubuntu 25.10ubuntu-advantage-toolspkg:deb/ubuntu/ubuntu-advantage-tools?arch=source&distro=questingOther threatsAffected
  • 35 – 37ubuntu0
6 affected builds
Fixed in–
Ubuntu 24.04 LTSubuntu-advantage-toolspkg:deb/ubuntu/ubuntu-advantage-tools?arch=source&distro=nobleOther threatsAffected
  • <37.2ubuntu~24.04.1
Fixed in
  • 37.2ubuntu~24.04.1
Ubuntu 22.04 LTSubuntu-advantage-toolspkg:deb/ubuntu/ubuntu-advantage-tools?arch=source&distro=jammyOther threatsAffected
  • <37.2ubuntu~22.04.1
Fixed in
  • 37.2ubuntu~22.04.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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