# CVE-2017-17806: Memory corruption in n/a

> A local attacker can trigger a kernel stack buffer overflow in the HMAC implementation via crafted system calls, potentially leading to code execution or privilege escalation.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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 Dec 2017
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2017-17806, GHSA-7cfh-r37c-4mqr, UBUNTU-CVE-2017-17806

## What is CVE-2017-17806?

CVE-2017-17806 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 20 Dec 2017. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker able to use the AF_ALG-based hash interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2017-17806?

It affects 8 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Opensuse Leap, Opensuse Project Leap, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server, Suse Linux Enterprise Server for Raspberry Pi.

## How do I fix CVE-2017-17806?

Apply the vendor's patch.

## Is CVE-2017-17806 being exploited?

There is no known exploitation of CVE-2017-17806 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-2017-17806 and fix it if it is affected.

What it is: CVE-2017-17806 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 20 Dec 2017. 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-2017-17806 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-2017-17806/ (Markdown: https://insights.sbomify.com/CVE-2017-17806/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-17806
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-17806
- OSV: https://osv.dev/vulnerability/CVE-2017-17806

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-17806/
Summaries are generated and may contain mistakes; the official description above is the record.