Stack Overflow Vulnerability in GFS2 Utilities by Red Hat
CVE-2026-71219

4.7MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
3 September 2026

What is CVE-2026-71219?

A stack overflow vulnerability exists in gfs2-utils, where the hash table traversal code in metawalk.c utilizes alloca() with an unvalidated size derived from an untrusted di_depth field of the GFS2 filesystem image. This flaw allows an attacker to craft a malicious GFS2 image with an excessively large di_depth value, leading to stack exhaustion and resulting in a denial of service when processed by utilities like fsck.gfs2, gfs2_edit, or savemeta. Proper validation mechanisms are crucial to mitigate this issue.

References

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

CVSS V3.1

Score:
4.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Tristan Madani (Talence Security) for reporting this issue.
.