SB20260424250 - Improper access control in Linux kernel smb server

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Main Vulnerability Database SB20260424250

SB20260424250 - Improper access control in Linux kernel smb server

Published: April 24, 2026

Security Bulletin ID SB20260424250
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-31476)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper access control in ksmbd session binding handling when processing a multichannel session binding request failure. A remote attacker can send a binding request with a wrong password to cause a denial of service.

The issue occurs because the target session looked up during binding can belong to another connection's user.


Remediation

Install update from vendor's website.

References