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CVE-2026-34961— barebox ext4 Extent Parsing Out-of-Bounds Read

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之前版本存在缓冲区错误漏洞，该漏洞源于ext4 extent解析中未验证eh_entries字段与缓冲区容量，可能导致攻击者提供恶意ext4文件系统镜像触发堆越界读取并可能重定向读取到任意磁盘偏移。

CVSS 6.2 · Medium EPSS 0.22% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
barebox barebox < 2026.04.0 affected
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I. Basic Information for CVE-2026-34961

Vulnerability Information
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Vulnerability Title
barebox ext4 Extent Parsing Out-of-Bounds Read
Source: CVE Program / CVE List V5
Vulnerability Description
barebox prior to version 2026.04.0 contains out-of-bounds read vulnerabilities in ext4 extent parsing due to missing validation of the eh_entries field against buffer capacity in fs/ext4/ext4_common.c. Attackers can supply a malicious ext4 filesystem image via USB, SD card, or network boot to trigger heap out-of-bounds reads during boot-time filesystem parsing, potentially redirecting reads to arbitrary disk offsets.
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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Barebox 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于ext4 extent解析中未验证eh_entries字段与缓冲区容量，可能导致攻击者提供恶意ext4文件系统镜像触发堆越界读取并可能重定向读取到任意磁盘偏移。
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-2026-34961

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III. Intelligence Information for CVE-2026-34961

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Vendor Advisories for CVE-2026-34961 (1)

Vendor Pages for CVE-2026-34961 (1)

Other References for CVE-2026-34961 (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-2026-34962 6.2 MEDIUM barebox ext4 Directory Parsing Infinite Loop Denial of Service

IV. Related Vulnerabilities

Same product: barebox
Same vendor: barebox
Same weakness: CWE-125

V. Comments for CVE-2026-34961

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