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CVE-2026-71219— Gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal

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 中发现了一个栈溢出漏洞。 中的哈希表遍历代码使用 分配内存，其大小由不受信任的磁盘上 字段推导得出，且未进行边界校验。如果攻击者构造一个具有较大 值的 GFS2 文件系统镜像，当该镜像被 、 或 处理时，将导致栈耗尽，从而引发拒绝服务（DoS）。

CVSS 4.7 · Medium

Possible ATT&CK Techniques 1 AI

T1298

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-2026-71219

Vulnerability Information
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Vulnerability Title
Gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal
Source: CVE Program / CVE List V5
Vulnerability Description
A stack overflow vulnerability was found in gfs2-utils. 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. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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-2026-71219

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III. Intelligence Information for CVE-2026-71219

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Vendor Advisories for CVE-2026-71219 (1)

Other References for CVE-2026-71219 (1)

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-2026-71221 7.0 HIGH Gfs2-utils: gfs2-utils: stack out-of-bounds write via unchecked height in savemeta
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

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 7
Same vendor: Red Hat
Same weakness: CWE-770

V. Comments for CVE-2026-71219

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