# CVE-2026-71219: Gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal

> Attackers can cause denial of service in GFS2 utilities by crafting a filesystem image with excessive depth values, triggering stack overflow.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/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:** 4 Sep 2026
- **Also known as:** AZL-99906, DEBIAN-CVE-2026-71219, GHSA-5ggp-489g-rjqr, UBUNTU-CVE-2026-71219

## What is CVE-2026-71219?

CVE-2026-71219 is a medium-severity denial of service 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 overflow vulnerability was found in gfs2-utils. The hash table traversal code in metawalk.c uses alloca() with an exponentially-derived size from the untrusted on-disk di_depth field without bounds validation. A crafted GFS2 filesystem image with a large di_depth value causes stack exhaustion and a denial of service when processed by fsck.gfs2, gfs2_edit, or savemeta.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-71219?

It affects 1 product.


Products: Redhat Enterprise Linux.

## How do I fix CVE-2026-71219?

Apply the vendor's patch.

## Is CVE-2026-71219 being exploited?

There is no known exploitation of CVE-2026-71219 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-2026-71219 and fix it if it is affected.

What it is: CVE-2026-71219 is a medium-severity denial of service 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-2026-71219 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-2026-71219/ (Markdown: https://insights.sbomify.com/CVE-2026-71219/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-71219
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71219
- OSV: https://osv.dev/vulnerability/CVE-2026-71219

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-71219/
Summaries are generated and may contain mistakes; the official description above is the record.