SB2026050622 - Improper input validation in Linux kernel ext4

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Main Vulnerability Database SB2026050622

SB2026050622 - Improper input validation in Linux kernel ext4

Published: May 6, 2026

Security Bulletin ID SB2026050622
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-43067)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in ext4_mb_scan_groups() when searching for blocks for indirect block mapped files. A local user can create or operate on a crafted ext4 file system layout to cause a denial of service.

The issue can occur on file systems where some files or directories are extent-mapped and others are indirect-block mapped.


Remediation

Install update from vendor's website.

References