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CVE-2026-34962— barebox ext4 Directory Parsing Infinite Loop Denial of Service

Quick assessment

Affected
barebox barebox
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.

Barebox是Barebox开源的一个多功能且灵活的引导加载程序。 Barebox 2026.04.0之前版本存在安全漏洞，该漏洞源于ext4目录解析中ext4fs_iterate_dir()函数未验证目录条目长度值非零，可能导致攻击者提供包含direntlen值为0的恶意ext4文件系统镜像导致无限循环并使引导过程无限挂起。

CVSS 6.2 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
barebox barebox < 2026.04.0 affected
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I. Basic Information for CVE-2026-34962

Vulnerability Information
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Vulnerability Title
barebox ext4 Directory Parsing Infinite Loop Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
barebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/ext4/ext4_common.c where the ext4fs_iterate_dir() function fails to validate that directory entry length values are non-zero. Attackers can supply a malicious ext4 filesystem image with a crafted directory entry containing a direntlen value of 0 to cause an infinite loop during directory listing or path resolution, resulting in the boot process hanging indefinitely.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Barebox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Barebox是Barebox开源的一个多功能且灵活的引导加载程序。 Barebox 2026.04.0之前版本存在安全漏洞，该漏洞源于ext4目录解析中ext4fs_iterate_dir()函数未验证目录条目长度值非零，可能导致攻击者提供包含direntlen值为0的恶意ext4文件系统镜像导致无限循环并使引导过程无限挂起。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
barebox barebox 0 ~ 2026.04.0 -

II. Public POCs for CVE-2026-34962

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III. Intelligence Information for CVE-2026-34962

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Vendor Advisories for CVE-2026-34962 (1)

Vendor Pages for CVE-2026-34962 (1)

Other References for CVE-2026-34962 (1)

Same Patch Batch · barebox · 2026-05-11 · 4 CVEs total

CVE-2026-34963 8.4 HIGH barebox EFI PE Loader Memory Safety Vulnerabilities
CVE-2026-34960 6.5 MEDIUM barebox Out-of-Bounds Read in DHCP Option Parsing
CVE-2026-34961 6.2 MEDIUM barebox ext4 Extent Parsing Out-of-Bounds Read

IV. Related Vulnerabilities

Same product: barebox
Same vendor: barebox
Same weakness: CWE-835

V. Comments for CVE-2026-34962

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