---
id: CVE-2025-40285
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb/server: fix possible refcount leak in smb2_sess_setup()

  Reference count of ksmbd_session will leak when session need reconnect.
  Fix this by adding the missing ksmb…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb/server: fix possible refcount leak in smb2_sess_setup()

  Reference count of ksmbd_session will leak when session need reconnect.
  Fix this by adding the missing ksmb…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
published: '2025-12-06'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T19:10:00.173'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40285'
references:
  - url: 'https://git.kernel.org/stable/c/379510a815cb2e64eb0a379cb62295d6ade65df0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6fc935f798d44a8eb8a5e6659198399fbf57b981'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dcc51dfe6ff26b52cac106865a172ac982d78401'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e671f9bb97805771380c98de944e2ceab6949188'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00411
epssPercentile: 0.33714
ingestedAt: '2026-10-15T19:25:46.335Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

smb/server: fix possible refcount leak in smb2_sess_setup()

Reference count of ksmbd_session will leak when session need reconnect.
Fix this by adding the missing ksmbd_user_session_put().

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.