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

Status: published. Published: 2026-09-03. Updated: 2026-11-05.

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.

## Remediation

- workaround: Run gfs2-utils tools in a containerized or VM-isolated environment when processing potentially compromised or untrusted GFS2 filesystem images. Disable automatic fsck at boot for GFS2 filesystems until patches are applied by setting fs_passno to 0 in /etc/fstab. Use ulimit -s to reduce the stack size limit, converting potential exploitation into a controlled crash. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 7 (gfs2-utils): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gfs2-utils): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gfs2-utils): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 4.7 (medium); CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.11% as of 2026-11-05; percentile 1.55%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-71219 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2507750 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-71219; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-71219; retrieved 2026-11-05; source updated Not reported

Revision: b257ef1a44e2a15ab99a709bfc4a33b8b5907aefccb1835a76497225395203e9

Canonical: https://y2.dev/cve/CVE-2026-71219

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