SB20260815230 - Use-after-free in Linux kernel ksmbd

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260815230

SB20260815230 - Use-after-free in Linux kernel ksmbd

Published: August 15, 2026

Security Bulletin ID SB20260815230
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) Use-after-free (CVE-ID: CVE-2026-72492)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a use-after-free in same_client_has_lease() and smb_grant_oplock() when handling lease state for existing client oplocks during concurrent close operations. A remote user can trigger a concurrent close condition to cause a denial of service.

The issue occurs because a pointer selected from ci->m_op_list can be used after the last reference is dropped before it is dereferenced.


Remediation

Install update from vendor's website.

References