CVE-2026-71219 Red Hat CVE debrief

Who should care

Users and administrators of systems utilizing gfs2-utils, especially those processing GFS2 filesystem images from untrusted sources, should validate di_depth values and monitor for crafted images to prevent denial of service. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure the security and integrity of their systems and data. Additionally, users should review compensating controls for exposed systems while remediation is scheduled and verified, and track exceptions, retest remediated assets, and close the item only after evidence is documented. It is also recommended to confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Check relevant monitoring, detection, and logs for exposed assets that need extra review. Implement compensating controls for fsck.gfs2, gfs2_edit, and savemeta. Monitor for crafted GFS2 filesystem images. Validate di_depth values in GFS2 filesystem images. Asset inventory and source tracking are also recommended. Rollback change windows if necessary. Exposure review should be done. Vendor patch guidance should be followed if available. Compensating controls should be reviewed. Monitoring should be in place. Asset inventory should be checked. Rollback change windows should be considered if needed. Source tracking should be implemented. Exposure review is recommended. Compensating controls should be implemented. Monitoring for crafted images is advised. Asset inventory review is suggested. Rollback change windows if necessary. Source tracking is recommended. Vendor patch guidance should be followed. Monitoring and detection should be in place. Exposure review should be conducted. Compensating controls should be reviewed. Asset inventory should be checked. Source tracking should be implemented. Vendor patch guidance should be followed. Monitoring should be implemented. Rollback change windows if  

Technical summary

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, leading to a stack overflow vulnerability in gfs2-utils. This vulnerability can be triggered by a crafted GFS2 filesystem image with a large di_depth value, causing stack exhaustion and a denial of service when processed by fsck.gfs2, gfs2_edit, or savemeta. The vulnerability affects gfs2-utils and can be addressed by validating di_depth values and monitoring for crafted GFS2 filesystem images.

Defensive priority

Medium-priority defensive actions are required to address the stack overflow vulnerability in gfs2-utils, focusing on validating di_depth values and monitoring for crafted GFS2 filesystem images.

Recommended defensive actions

• Validate di_depth values in GFS2 filesystem images
• Monitor for crafted GFS2 filesystem images
• Implement compensating controls for fsck.gfs2, gfs2_edit, and savemeta
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the stack overflow vulnerability in gfs2-utils. Red Hat has a reference for this CVE, indicating potential impact on their systems. The vulnerability was introduced due to the hash table traversal code in metawalk.c using 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. Users should verify di_depth values and monitor for crafted images to prevent denial of service. The CVE Program and NVD provide additional context and details on this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.