SB20260815168 - Improper input validation in Linux kernel ext4

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Main Vulnerability Database SB20260815168

SB20260815168 - Improper input validation in Linux kernel ext4

Published: August 15, 2026

Security Bulletin ID SB20260815168
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-2026-74308)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.8 [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]


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

The vulnerability exists due to improper state validation in ext4_journalled_write_end() and ext4_write_inline_data_end() when handling writes on an ext4 filesystem mounted with the data=journal option after a failed inline-data-to-extent conversion. A local user can trigger a crafted write operation to cause a denial of service.

The issue can be triggered when a previous attempt to convert inline data to an extent fails, such as due to insufficient space.


Remediation

Install update from vendor's website.

References