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CVE-2025-40286
smb/server: fix possible memory leak in smb2_read()
Description

In the Linux kernel, the following vulnerability has been resolved: smb/server: fix possible memory leak in smb2_read() Memory leak occurs when ksmbd_vfs_read() fails. Fix this by adding the missing kvfree().

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-2025-40286 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
Apply the fix to prevent memory leaks in smb2_read by freeing kernel memory.
  • Apply the provided kernel patch for smb2_read.
  • Ensure ksmbd_vfs_read handles errors correctly.
  • Review kernel memory management in SMB operations.
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-2025-40286.

URL Resource
https://git.kernel.org/stable/c/0797c6cf3b857cc229ab2bc69552938dcd738d78
https://git.kernel.org/stable/c/63d8706a2c09a0c29b8b0e8a44bc7a1339685de9
https://git.kernel.org/stable/c/6fced056d2cc8d01b326e6fcfabaacb9850b71a4
https://git.kernel.org/stable/c/bfda5422a16651d0bf864ec468b1c216e1b10d91
https://git.kernel.org/stable/c/f1305587731886da37a214cda812ade246c653b0
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40286 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-2025-40286 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-2025-40286 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-2025-40286 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 memory leak in smb2_read() Memory leak occurs when ksmbd_vfs_read() fails. Fix this by adding the missing kvfree().
    Added Reference https://git.kernel.org/stable/c/0797c6cf3b857cc229ab2bc69552938dcd738d78
    Added Reference https://git.kernel.org/stable/c/63d8706a2c09a0c29b8b0e8a44bc7a1339685de9
    Added Reference https://git.kernel.org/stable/c/6fced056d2cc8d01b326e6fcfabaacb9850b71a4
    Added Reference https://git.kernel.org/stable/c/bfda5422a16651d0bf864ec468b1c216e1b10d91
    Added Reference https://git.kernel.org/stable/c/f1305587731886da37a214cda812ade246c653b0
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.