# CVE-2015-4106: Privilege escalation in n/a

> Local guests can exploit improper PCI config space restrictions in QEMU to escalate privileges or crash the host system.

- **Severity:** Medium 4.6 (`AV:L/AC:L/Au:N/C:P/I:P/A:P`)
- **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:** 3 Jun 2015
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-4106, GHSA-53r2-p844-jg4x, UBUNTU-CVE-2015-4106

## What is CVE-2015-4106?

CVE-2015-4106 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 3 Jun 2015. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service (host crash), obtain sensitive information, or possibly have other unspecified impact via unknown vectors.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2015-4106?

It affects 8 products.


Products: Canonical Ubuntu Linux, Citrix Xenserver, Debian Debian Linux, Fedoraproject Fedora, Qemu Qemu, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server, Suse Linux Enterprise Software Development Kit.

## How do I fix CVE-2015-4106?

Apply the vendor's patch.

## Is CVE-2015-4106 being exploited?

There is no known exploitation of CVE-2015-4106 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-4106 and fix it if it is affected.

What it is: CVE-2015-4106 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 3 Jun 2015. 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-2015-4106 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-2015-4106/ (Markdown: https://insights.sbomify.com/CVE-2015-4106/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-4106
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-4106
- OSV: https://osv.dev/vulnerability/CVE-2015-4106

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-4106/
Summaries are generated and may contain mistakes; the official description above is the record.