SB20260528182 - Race condition in Linux kernel ext4

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Main Vulnerability Database SB20260528182

SB20260528182 - Race condition in Linux kernel ext4

Published: May 28, 2026

Security Bulletin ID SB20260528182
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) Race condition (CVE-ID: CVE-2026-45892)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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 synchronization in ext4 extent status tree handling in ext4_split_extent() when processing buffered writes to the middle of an unwritten extent without dioread_nolock enabled. A local user can trigger a stale unwritten extent entry to cause a denial of service.

The issue occurs when splitting an unwritten extent in the middle and converting it to initialized after a partial zeroout operation leaves extent status information inconsistent with the on-disk extent state.


Remediation

Install update from vendor's website.

References