# CVE-2015-7971: Denial of service in n/a

> Local guests can cause a denial of service in the Xen hypervisor by sending crafted profiling hypercalls that trigger excessive console logging.

- **Severity:** Low 2.1 (`AV:L/AC:L/Au:N/C:N/I:N/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:** 30 Oct 2015
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-7971, GHSA-p377-fgpq-vgvx, UBUNTU-CVE-2015-7971

## What is CVE-2015-7971?

CVE-2015-7971 is a low-severity denial of service vulnerability in Xen Xen, published on 30 Oct 2015. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Xen 3.2.x through 4.6.x does not limit the number of printk console messages when logging certain pmu and profiling hypercalls, which allows local guests to cause a denial of service via a sequence of crafted (1) HYPERCALL_xenoprof_op hypercalls, which are not properly handled in the do_xenoprof_op function in common/xenoprof.c, or (2) HYPERVISOR_xenpmu_op hypercalls, which are not properly handled in the do_xenpmu_op function in arch/x86/cpu/vpmu.c.

Weakness: CWE-19

## Which versions are affected by CVE-2015-7971?

It affects 1 product.


Products: Xen Xen.

## How do I fix CVE-2015-7971?

Apply the vendor's patch.

## Is CVE-2015-7971 being exploited?

There is no known exploitation of CVE-2015-7971 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-2015-7971 and fix it if it is affected.

What it is: CVE-2015-7971 is a low-severity denial of service vulnerability in Xen Xen, published on 30 Oct 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-2015-7971 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-2015-7971/ (Markdown: https://insights.sbomify.com/CVE-2015-7971/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7971
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7971
- OSV: https://osv.dev/vulnerability/CVE-2015-7971

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-7971/
Summaries are generated and may contain mistakes; the official description above is the record.