barebox up to 2026.04.0 ext4 /fs/ext4/ext4_common.c eh_entries out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in barebox up to 2026.04.0 and classified as problematic. Impacted is an unknown function of the file /fs/ext4/ext4_common.c of the component ext4 Handler. Executing a manipulation of the argument eh_entries can lead to out-of-bounds. The identification of this vulnerability is CVE-2026-34961. The attack can only be executed locally. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in barebox up to 2026.04.0 and classified as problematic. This vulnerability affects an unknown code of the file /fs/ext4/ext4_common.c of the component ext4 Handler. The manipulation of the argument eh_entries with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. CVE summarizes:

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.

The weakness was shared by Kazuma Matsumoto. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-34961 since 03/31/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 2026.04.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.7
NVD Vector: 🔒

CNA Base Score: 6.2
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: barebox 2026.04.0

Timelineinfo

03/31/2026 CVE reserved
05/12/2026 +42 days Advisory disclosed
05/12/2026 +0 days VulDB entry created
07/18/2026 +67 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Researcher: Kazuma Matsumoto
Status: Confirmed

CVE: CVE-2026-34961 (🔒)
GCVE (CVE): GCVE-0-2026-34961
GCVE (VulDB): GCVE-100-362884

Entryinfo

Created: 05/12/2026 04:28
Updated: 07/18/2026 05:41
Changes: 05/12/2026 04:28 (79), 07/18/2026 05:41 (11)
Complete: 🔍
Cache ID: 216::103

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