CVE-2026-71221

Summary

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

Affected Software

Weaknesses

• CWE-787: Out-of-bounds Write

Workarounds

Do not run gfs2-utils savemeta 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.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://access.redhat.com/security/cve/CVE-2026-71221
• https://bugzilla.redhat.com/show_bug.cgi?id=2511396

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