SB2026072093 - NULL pointer dereference in Linux kernel smb server

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Main Vulnerability Database SB2026072093

SB2026072093 - NULL pointer dereference in Linux kernel smb server

Published: July 20, 2026

Security Bulletin ID SB2026072093
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) NULL pointer dereference (CVE-ID: CVE-2026-64141)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/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 null pointer dereference in compare_guid_key() in fs/smb/server/oplock.c when processing SMB2 CREATE requests with a lease context after session teardown on the same TCP connection. A remote user can send crafted SMB2 session and create requests to cause a denial of service.

Exploitation requires a successful SMB2 SESSION_SETUP and a share configured with durable handles enabled.


Remediation

Install update from vendor's website.

References