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

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-03 · updated 2026-09-22
Weakness: CWE-770

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.

Affected products

Red Hat Enterprise Linux: 7.0, 8.0, 9.0

References

https://access.redhat.com/security/cve/CVE-2026-71219
https://bugzilla.redhat.com/show_bug.cgi?id=2507750

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