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CVE-2026-71221— Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 7
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 gfs2-utils 中发现了一个栈越界写漏洞。在 savemeta 中，从磁盘 inode 元数据中读取的 height 值被直接用作循环边界，而未进行边界检查，导致在处理特制的 GFS2 文件系统镜像时发生栈缓冲区溢出，可能导致任意代码执行。

CVSS 7.0 · High

Affected Version Matrix 3

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-71221

Vulnerability Information
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Vulnerability Title
Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-71221

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III. Intelligence Information for CVE-2026-71221

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Vendor Advisories for CVE-2026-71221 (2)

Same Patch Batch · Red Hat · 2026-09-03 · 7 CVEs total

CVE-2026-85150 7.5 HIGH Gstreamer1-plugins-base: gstreamer: null/invalid-pointer dereference in gst_rtsp_message_p
CVE-2026-71220 7.0 HIGH Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked di_height in gfs2_edit
CVE-2026-84185 5.9 MEDIUM Jwcrypto: jwcrypto: general json jws kid binding bypass during jwkset verification
CVE-2026-71222 5.3 MEDIUM Gfs2-utils: gfs2-utils: heap out-of-bounds read via unchecked ea_num_ptrs in extended attr
CVE-2026-71224 4.7 MEDIUM Gfs2-utils: gfs2-utils: stack overflow via alloca(i_height) in metadata walk
CVE-2026-71219 4.7 MEDIUM Gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 7
Same vendor: Red Hat
Same weakness: CWE-787

V. Comments for CVE-2026-71221

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