# CVE-2026-71220: Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked di_height in gfs2_edit

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

A stack out-of-bounds write vulnerability was found in gfs2-utils. In gfs2_edit, the di_height field from on-disk inode metadata is used as an array index without bounds checking, causing a stack buffer overflow that may lead to arbitrary code execution when processing crafted GFS2 filesystem images.

## Remediation

- workaround: Do not run gfs2_edit on untrusted or potentially compromised GFS2 filesystem images. Run gfs2-utils tools in a containerized or VM-isolated environment when processing untrusted images. Disable automatic fsck at boot for GFS2 filesystems until patches are applied by setting fs_passno to 0 in /etc/fstab. (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: 7 (high); CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-05; percentile 2.95%

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

- Weaknesses: CWE-787

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-71220 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2511398 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-71220; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-71220; retrieved 2026-11-05; source updated Not reported

Revision: a6c211685ea1c6a566bd4854cfd5fb6a723857ab356bbb3df9181c3c3bcd26a4

Canonical: https://y2.dev/cve/CVE-2026-71220

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