# CVE-2016-1570: Privilege escalation in n/a

> Local PV guests can gain privileges, cause denial of service, or read sensitive information via crafted page identifiers in Xen hypervisor.

- **Severity:** High 8.5 (`CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Jan 2016
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-1570, GHSA-w7v4-4295-6vg3, UBUNTU-CVE-2016-1570

## What is CVE-2016-1570?

CVE-2016-1570 is a high-severity vulnerability in Xen Xen, published on 22 Jan 2016. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The PV superpage functionality in arch/x86/mm.c in Xen 3.4.0, 3.4.1, and 4.1.x through 4.6.x allows local PV guests to obtain sensitive information, cause a denial of service, gain privileges, or have unspecified other impact via a crafted page identifier (MFN) to the (1) MMUEXT_MARK_SUPER or (2) MMUEXT_UNMARK_SUPER sub-op in the HYPERVISOR_mmuext_op hypercall or (3) unknown vectors related to page table updates.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2016-1570?

It affects 1 product.


Products: Xen Xen.

## How do I fix CVE-2016-1570?

Apply the vendor's patch.

## Is CVE-2016-1570 being exploited?

There is no known exploitation of CVE-2016-1570 in the wild and no public exploit code.

## Other vulnerabilities in Xen Xen

- [CVE-2017-10912](https://insights.sbomify.com/CVE-2017-10912/): Privilege escalation in n/a (critical 10.0)
- [CVE-2017-10918](https://insights.sbomify.com/CVE-2017-10918/): Memory corruption in n/a (critical 10.0)
- [CVE-2017-10920](https://insights.sbomify.com/CVE-2017-10920/): Memory corruption in n/a (critical 10.0)
- [CVE-2017-10921](https://insights.sbomify.com/CVE-2017-10921/): Memory corruption in n/a (critical 10.0)
- [CVE-2025-27466](https://insights.sbomify.com/CVE-2025-27466/): Mutiple vulnerabilities in the Viridian interface (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-1570 and fix it if it is affected.

What it is: CVE-2016-1570 is a high-severity vulnerability in Xen Xen, published on 22 Jan 2016. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-1570 in the wild and no public exploit code.

Affected product: Xen Xen. 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-2016-1570/ (Markdown: https://insights.sbomify.com/CVE-2016-1570/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1570
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1570
- OSV: https://osv.dev/vulnerability/CVE-2016-1570

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-1570/
Summaries are generated and may contain mistakes; the official description above is the record.