SB2026102422 - Race condition in Linux kernel btrfs

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Main Vulnerability Database SB2026102422

SB2026102422 - Race condition in Linux kernel btrfs

Published: October 24, 2026

Security Bulletin ID SB2026102422
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-98907)

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

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to potentially cause a denial of service by disrupting Btrfs superblock reads.

The vulnerability exists due to a race condition in the Btrfs sb_write_pointer() function when reading a superblock from the block device page cache concurrently with block size changes. A local privileged user can attempt to overlap block size changes through BLKBSZSET with reads through read_cache_page_gfp() to potentially cause inconsistent reads and disrupt filesystem operations.


Remediation

Install update from vendor's website.

References