# CVE-2026-71221: Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta

> Attackers can execute arbitrary code by crafting GFS2 filesystem images that trigger a stack buffer overflow in savemeta due to unchecked height values.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 3 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** AZL-99900, DEBIAN-CVE-2026-71221, GHSA-6q6f-22jw-g823, UBUNTU-CVE-2026-71221

## What is CVE-2026-71221?

CVE-2026-71221 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 3 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A stack out-of-bounds write vulnerability was found in gfs2-utils. In savemeta, the height value from on-disk inode metadata is used as a loop bound without bounds checking, causing a stack buffer overflow that may lead to arbitrary code execution when processing crafted GFS2 filesystem images.

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

## Which versions are affected by CVE-2026-71221?

It affects 1 product.


Products: Redhat Enterprise Linux.

## How do I fix CVE-2026-71221?

Apply the vendor's patch.

## Is CVE-2026-71221 being exploited?

There is no known exploitation of CVE-2026-71221 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2018-14667](https://insights.sbomify.com/CVE-2018-14667/): Red Hat JBoss RichFaces Framework Expression Language Injection (critical 9.8, exploited in the wild)
- [CVE-2021-20325](https://insights.sbomify.com/CVE-2021-20325/): Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit (critical 9.8)
- [CVE-2018-25011](https://insights.sbomify.com/CVE-2018-25011/): Memory corruption in libwebp (critical 9.8)
- [CVE-2018-25014](https://insights.sbomify.com/CVE-2018-25014/): Other in libwebp (critical 9.8)
- [CVE-2014-3585](https://insights.sbomify.com/CVE-2014-3585/): Supply chain in redhat-upgrade-tool (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-71221 and fix it if it is affected.

What it is: CVE-2026-71221 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 3 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-71221 in the wild and no public exploit code.

Affected product: Redhat Enterprise 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-2026-71221/ (Markdown: https://insights.sbomify.com/CVE-2026-71221/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-71221
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71221
- OSV: https://osv.dev/vulnerability/CVE-2026-71221

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-71221/
Summaries are generated and may contain mistakes; the official description above is the record.