# CVE-2016-1581: Information disclosure in n/a

> Local users can read arbitrary container data due to world-readable permissions on the ZFS image file in LXD.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Jun 2016
- **Updated:** 5 Aug 2024
- **Also known as:** UBUNTU-CVE-2016-1581

## What is CVE-2016-1581?

CVE-2016-1581 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 9 Jun 2016. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

LXD before 2.0.2 uses world-readable permissions for /var/lib/lxd/zfs.img when setting up a loop based ZFS pool, which allows local users to copy and read data from arbitrary containers via unspecified vectors.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2016-1581?

It affects 2 products.


Products: Canonical Lxd, Canonical Ubuntu Linux.

## How do I fix CVE-2016-1581?

Upgrade to a fixed version.

## Is CVE-2016-1581 being exploited?

There is no known exploitation of CVE-2016-1581 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2026-66897](https://insights.sbomify.com/CVE-2026-66897/): Instance template path traversal allows arbitrary host file write as root (critical 9.9)
- [CVE-2026-62420](https://insights.sbomify.com/CVE-2026-62420/): Cross-project cluster migration bypasses project restrictions via cluster notification flag (critical 9.9)
- [CVE-2026-63293](https://insights.sbomify.com/CVE-2026-63293/): Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root (critical 9.9)
- [CVE-2026-63294](https://insights.sbomify.com/CVE-2026-63294/): Root RCE via image backup.yaml symlink (critical 9.9)
- [CVE-2026-63296](https://insights.sbomify.com/CVE-2026-63296/): Project restriction bypass via instance migration config override (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-1581 and fix it if it is affected.

What it is: CVE-2016-1581 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 9 Jun 2016. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-1581 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2016-1581/ (Markdown: https://insights.sbomify.com/CVE-2016-1581/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1581
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1581
- OSV: https://osv.dev/vulnerability/CVE-2016-1581

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-1581/
Summaries are generated and may contain mistakes; the official description above is the record.