SB20260406107 - Use-after-free in Linux kernel smb server

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Main Vulnerability Database SB20260406107

SB20260406107 - Use-after-free in Linux kernel smb server

Published: April 6, 2026

Security Bulletin ID SB20260406107
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 security vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-23428)

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

The vulnerability exists due to use-after-free in smb2_get_ksmbd_tcon compound request handling when processing crafted compound smb requests. A remote attacker can send a compound request that disconnects a tree connection and then triggers subsequent commands to dereference freed share_conf data to cause a denial of service.

The issue occurs because the compound request reuse path reuses work->tcon without validating that t_state remains TREE_CONNECTED after an SMB2_TREE_DISCONNECT operation.


Remediation

Install update from vendor's website.

References