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CVE-2025-40103
smb: client: Fix refcount leak for cifs_sb_tlink
Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix refcount leak for cifs_sb_tlink Fix three refcount inconsistency issues related to `cifs_sb_tlink`. Comments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be called after successful calls to `cifs_sb_tlink()`. Three calls fail to update refcount accordingly, leading to possible resource leaks.

INFO

Published Date :

Oct. 30, 2025, 10:15 a.m.

Last Modified :

Oct. 30, 2025, 3:03 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-40103 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 refcount inconsistencies in the Linux kernel's CIFS client to prevent resource leaks.
  • Apply the latest Linux kernel updates.
  • Ensure `cifs_put_tlink()` is called correctly.
  • Review refcount management for `cifs_sb_tlink`.
  • Test for resource leakages after applying updates.
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-2025-40103.

URL Resource
https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692
https://git.kernel.org/stable/c/896bb31e1416f582503db1350cf1bd10dc64e5a6
https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc
https://git.kernel.org/stable/c/d7dd034c14928306db1b46be277ae439b84dacf9
https://git.kernel.org/stable/c/e15605b68b490186da2ad8029c0351a9cfb0b9af
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40103 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-2025-40103 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-2025-40103 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-2025-40103 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

    Oct. 30, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix refcount leak for cifs_sb_tlink Fix three refcount inconsistency issues related to `cifs_sb_tlink`. Comments for `cifs_sb_tlink` state that `cifs_put_tlink()` needs to be called after successful calls to `cifs_sb_tlink()`. Three calls fail to update refcount accordingly, leading to possible resource leaks.
    Added Reference https://git.kernel.org/stable/c/790282abe9d805f08618c1c24ea2529e7259b692
    Added Reference https://git.kernel.org/stable/c/896bb31e1416f582503db1350cf1bd10dc64e5a6
    Added Reference https://git.kernel.org/stable/c/c2b77f42205ef485a647f62082c442c1cd69d3fc
    Added Reference https://git.kernel.org/stable/c/d7dd034c14928306db1b46be277ae439b84dacf9
    Added Reference https://git.kernel.org/stable/c/e15605b68b490186da2ad8029c0351a9cfb0b9af
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.