# CVE-2006-5173: Denial of service in n/a

> Local attackers can crash other processes by manipulating EFLAGS during context switches, causing a denial of service.

- **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:** No
- **Published:** 17 Oct 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-pm7g-vxcv-89q8

## What is CVE-2006-5173?

CVE-2006-5173 is a low-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 17 Oct 2006. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.

## Which versions are affected by CVE-2006-5173?

It affects 2 products.


Products: Canonical Ubuntu Linux, Linux kernel.

## How do I fix CVE-2006-5173?

No fix has been published for CVE-2006-5173 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-5173 being exploited?

There is no known exploitation of CVE-2006-5173 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-2006-5173 and fix it if it is affected.

What it is: CVE-2006-5173 is a low-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 17 Oct 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-2006-5173 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-2006-5173/ (Markdown: https://insights.sbomify.com/CVE-2006-5173/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-5173
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-5173
- OSV: https://osv.dev/vulnerability/CVE-2006-5173

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-5173/
Summaries are generated and may contain mistakes; the official description above is the record.