SB20260424198 - Race condition in Linux kernel btrfs

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Main Vulnerability Database SB20260424198

SB20260424198 - Race condition in Linux kernel btrfs

Published: April 24, 2026

Security Bulletin ID SB20260424198
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-2026-31519)

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

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 a race condition in btrfs subvolume lookup and orphan cleanup handling when looking up a subvolume after dentry cache eviction with concurrent delayed iputs and unlink activity. A local user can trigger concurrent filesystem operations to cause a denial of service.

The issue can result in a negative dentry being created for a valid subvolume, causing filesystem operations on that subvolume to fail and potentially abort the filesystem.


Remediation

Install update from vendor's website.

References