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

CVE-2026-71219 is fixed in gfs2-utils on 1 platform by DEBIAN-CVE-2026-71219 (version 3.6.1-2), released September 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-71219
- Priority: Routine
- CVSS: 4.7 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 3, 2026
- Weakness: Allocation of Resources Without Limits or Throttling
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71219

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gfs2-utils Debian 14 | 3.6.1-2 | [DEBIAN-CVE-2026-71219](https://patchblox.com/security/data/fix/linux/debian-cve-2026-71219.md) | Sep 3, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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