SB20260502129 - Missing Release of Resource after Effective Lifetime in Linux kernel smb server

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Main Vulnerability Database SB20260502129

SB20260502129 - Missing Release of Resource after Effective Lifetime in Linux kernel smb server

Published: May 2, 2026

Security Bulletin ID SB20260502129
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) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-31711)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

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 resource management in ksmbd_tcp_new_connection() when handling TCP connections that trigger transport allocation failure. A remote attacker can hold open connections with large RFC1002 lengths to cause a denial of service.

The issue is reachable pre-authentication over TCP port 445, and repeated allocation failures can exhaust the connection slot counter until subsequent connection attempts are rejected for the remainder of the boot.


Remediation

Install update from vendor's website.

References