Bug 2527993

Summary: CVE-2026-71221 gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta [fedora-all]
Product: [Fedora] Fedora Reporter: Samuele Negrini <snegrini>
Component: gfs2-utilsAssignee: Andrew Price <anprice>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: agk, agruenba, anprice, bmarzins, cfeist
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["86551308-1be3-49e5-b08f-c20da020b8de"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2511396    

Description Samuele Negrini 2026-09-03 11:47:33 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in gfs2-utils. In the savemeta function in savemeta.c, the height value from on-disk inode metadata controls a loop over a fixed-size stack array (10 elements) without bounds validation. An attacker can craft a GFS2 filesystem image with a height value exceeding 10 to write past the end of the array, corrupting adjacent stack memory. This is the same vulnerability class as the di_height OOB write in gfs2_edit (extended.c) but in a different code path. The stack buffer overflow may allow arbitrary code execution when savemeta processes the crafted image. The Linux kernel GFS2 driver validates i_height against sd_max_height in gfs2_dinode_in(), but the userspace gfs2-utils performs no equivalent validation.