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CVE-2025-40285
smb/server: fix possible refcount leak in smb2_sess_setup()
Description

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().

INFO

Published Date :

Dec. 6, 2025, 10:15 p.m.

Last Modified :

Dec. 6, 2025, 10:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-40285 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Address a reference count leak in the SMB server session setup by adding a missing session put call.
  • Apply the provided patch to the Linux kernel.
  • Rebuild and deploy the updated kernel.
  • Verify the fix by testing session reconnect scenarios.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-40285.

URL Resource
https://git.kernel.org/stable/c/379510a815cb2e64eb0a379cb62295d6ade65df0
https://git.kernel.org/stable/c/6fc935f798d44a8eb8a5e6659198399fbf57b981
https://git.kernel.org/stable/c/d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d
https://git.kernel.org/stable/c/dcc51dfe6ff26b52cac106865a172ac982d78401
https://git.kernel.org/stable/c/e671f9bb97805771380c98de944e2ceab6949188
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40285 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-40285 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-40285 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-40285 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Dec. 06, 2025

    Action Type Old Value New Value
    Added Description 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().
    Added Reference https://git.kernel.org/stable/c/379510a815cb2e64eb0a379cb62295d6ade65df0
    Added Reference https://git.kernel.org/stable/c/6fc935f798d44a8eb8a5e6659198399fbf57b981
    Added Reference https://git.kernel.org/stable/c/d37b2c81c83d6c0d5ca582f4fe73c672983f9e0d
    Added Reference https://git.kernel.org/stable/c/dcc51dfe6ff26b52cac106865a172ac982d78401
    Added Reference https://git.kernel.org/stable/c/e671f9bb97805771380c98de944e2ceab6949188
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.