SB20261022277 - Race condition in Linux kernel smb client

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Main Vulnerability Database SB20261022277

SB20261022277 - Race condition in Linux kernel smb client

Published: October 22, 2026

Security Bulletin ID SB20261022277
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-98681)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to potentially corrupt SMB client file state by causing concurrent flag updates to be lost.

The vulnerability exists due to a race condition in the Linux kernel SMB client's struct cifsFileInfo when concurrent code paths update flags stored in the same bitfield byte under different locks. A local user can potentially trigger overlapping SMB file operations to cause byte-level read-modify-write operations on one flag to overwrite concurrent changes to another flag, leaving file state inconsistent.


Remediation

Install update from vendor's website.

References