CVE intelligence

CVE-2026-43228

Vulnerability intelligence

Published May 6, 2026Sources checked Nov 12, 2026

5.5MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-43228 and is rated Medium severity with a CVSS score of 5.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: May 19, 2026

CBL-Mariner Releases

Vendor-listed releases

6.6.137.1-2

CISA KEVNot listedBased on the latest collected catalog

EPSS0.1%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-43228?

In the Linux kernel, the following vulnerability has been resolved:

hfs: Replace BUG_ON with error handling for CNID count checks

In a06ec283e125 next_id, folder_count, and file_count in the super block info were expanded to 64 bits, and BUG_ONs were added to detect overflow. This triggered an error reported by syzbot: if the MDB is corrupted, the BUG_ON is triggered.

This patch replaces this mechanism with proper error handling and resolves the syzbot reported bug.

Singed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>

Source: NVD