Barebox up to 2026.04.0 Directory fs/ext4/ext4_common.c ext4fs_iterate_dir infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Barebox up to 2026.04.0. Impacted is the function ext4fs_iterate_dir of the file fs/ext4/ext4_common.c of the component Directory Handler. The manipulation results in infinite loop. This vulnerability is identified as CVE-2026-34962. The attack is only possible with local access. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Barebox up to 2026.04.0. It has been classified as problematic. Affected is the function ext4fs_iterate_dir of the file fs/ext4/ext4_common.c of the component Directory Handler. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was released by Kazuma Matsumoto. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34962 since 03/31/2026. The exploitability is told 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: 5.0
VulDB Meta Temp Score: 5.0

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

NVD Base Score: 5.5
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: Infinite loop
CWE: CWE-835 / CWE-404
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-2026-34962 (🔒)
GCVE (CVE): GCVE-0-2026-34962
GCVE (VulDB): GCVE-100-362796

Entryinfo

Created: 05/12/2026 04:01
Updated: 07/18/2026 05:41
Changes: 05/12/2026 04:01 (79), 07/18/2026 05:41 (11)
Complete: 🔍
Cache ID: 216::103

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