SB20261022283 - Incomplete cleanup in Linux kernel smb client

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Main Vulnerability Database SB20261022283

SB20261022283 - Incomplete cleanup in Linux kernel smb client

Published: October 22, 2026

Security Bulletin ID SB20261022283
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) Incomplete cleanup (CVE-ID: CVE-2026-98686)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause cached data written past the end of a file to become visible as file content after the file is extended.

The vulnerability exists due to incomplete page-cache invalidation in the Linux kernel SMB client's smb3_zero_range() function when extending a file through a zero-range operation. A local user can write past the existing end of the file through a memory mapping and extend the file through a zero-range operation to expose retained cached data as file content.


Remediation

Install update from vendor's website.

References