# CVE-2006-1056: Information disclosure in n/a

> Local attackers can exploit AMD64 floating-point register handling to leak sensitive data, such as cryptographic keys, from other processes.

- **Severity:** Low 2.1 (`AV:L/AC:L/Au:N/C:P/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:** 20 Apr 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-g998-qjcg-g7jh

## What is CVE-2006-1056?

CVE-2006-1056 is a low-severity vulnerability in Freebsd Freebsd, published on 20 Apr 2006. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Linux kernel before 2.6.16.9 and the FreeBSD kernel, when running on AMD64 and other 7th and 8th generation AuthenticAMD processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one process to determine portions of the state of floating point instructions of other processes, which can be leveraged to obtain sensitive information such as cryptographic keys. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels.

Weakness: CWE-310

## Which versions are affected by CVE-2006-1056?

It affects 2 products.


Products: Freebsd Freebsd, Linux kernel.

## How do I fix CVE-2006-1056?

Apply the vendor's patch.

## Is CVE-2006-1056 being exploited?

There is no known exploitation of CVE-2006-1056 in the wild and no public exploit code.

## Other vulnerabilities in Freebsd Freebsd

- [CVE-2018-17160](https://insights.sbomify.com/CVE-2018-17160/): Memory corruption in FreeBSD (critical 10.0)
- [CVE-2014-3954](https://insights.sbomify.com/CVE-2014-3954/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-4304](https://insights.sbomify.com/CVE-2006-4304/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-0226](https://insights.sbomify.com/CVE-2006-0226/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0002](https://insights.sbomify.com/CVE-2004-0002/): Denial of service in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-1056 and fix it if it is affected.

What it is: CVE-2006-1056 is a low-severity vulnerability in Freebsd Freebsd, published on 20 Apr 2006. 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-2006-1056 in the wild and no public exploit code.

Affected product: Freebsd Freebsd. 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-2006-1056/ (Markdown: https://insights.sbomify.com/CVE-2006-1056/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-1056
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-1056
- OSV: https://osv.dev/vulnerability/CVE-2006-1056

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-1056/
Summaries are generated and may contain mistakes; the official description above is the record.