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CVE-2025-39697
NFS: Fix a race when updating an existing write
Description

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a race when updating an existing write After nfs_lock_and_join_requests() tests for whether the request is still attached to the mapping, nothing prevents a call to nfs_inode_remove_request() from succeeding until we actually lock the page group. The reason is that whoever called nfs_inode_remove_request() doesn't necessarily have a lock on the page group head. So in order to avoid races, let's take the page group lock earlier in nfs_lock_and_join_requests(), and hold it across the removal of the request in nfs_inode_remove_request().

INFO

Published Date :

Sept. 5, 2025, 6:15 p.m.

Last Modified :

Nov. 3, 2025, 6:16 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-39697 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 Linux kernel updates to resolve the NFS race condition vulnerability.
  • Update the Linux kernel to the patched version.
  • Rebuild and deploy the kernel.
  • Verify the fix by testing NFS 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-2025-39697.

URL Resource
https://git.kernel.org/stable/c/0ff42a32784e0f2cb46a46da8e9f473538c13e1b
https://git.kernel.org/stable/c/181feb41f0b268e6288bf9a7b984624d7fe2031d
https://git.kernel.org/stable/c/202a3432d21ac060629a760fff3b0a39859da3ea
https://git.kernel.org/stable/c/76d2e3890fb169168c73f2e4f8375c7cc24a765e
https://git.kernel.org/stable/c/92278ae36935a54e65fef9f8ea8efe7e80481ace
https://git.kernel.org/stable/c/c32e3c71aaa1c1ba05da88605e2ddd493c58794f
https://git.kernel.org/stable/c/f230d40147cc37eb3aef4d50e2e2c06ea73d9a77
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39697 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-2025-39697 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-2025-39697 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-2025-39697 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.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 08, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/0ff42a32784e0f2cb46a46da8e9f473538c13e1b
    Added Reference https://git.kernel.org/stable/c/181feb41f0b268e6288bf9a7b984624d7fe2031d
    Added Reference https://git.kernel.org/stable/c/c32e3c71aaa1c1ba05da88605e2ddd493c58794f
    Added Reference https://git.kernel.org/stable/c/f230d40147cc37eb3aef4d50e2e2c06ea73d9a77
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 05, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a race when updating an existing write After nfs_lock_and_join_requests() tests for whether the request is still attached to the mapping, nothing prevents a call to nfs_inode_remove_request() from succeeding until we actually lock the page group. The reason is that whoever called nfs_inode_remove_request() doesn't necessarily have a lock on the page group head. So in order to avoid races, let's take the page group lock earlier in nfs_lock_and_join_requests(), and hold it across the removal of the request in nfs_inode_remove_request().
    Added Reference https://git.kernel.org/stable/c/202a3432d21ac060629a760fff3b0a39859da3ea
    Added Reference https://git.kernel.org/stable/c/76d2e3890fb169168c73f2e4f8375c7cc24a765e
    Added Reference https://git.kernel.org/stable/c/92278ae36935a54e65fef9f8ea8efe7e80481ace
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.