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CVE-2025-39965
xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: xfrm_alloc_spi shouldn't use 0 as SPI x->id.spi == 0 means "no SPI assigned", but since commit 94f39804d891 ("xfrm: Duplicate SPI Handling"), we now create states and add them to the byspi list with this value. __xfrm_state_delete doesn't remove those states from the byspi list, since they shouldn't be there, and this shows up as a UAF the next time we go through the byspi list.

INFO

Published Date :

Oct. 13, 2025, 2:15 p.m.

Last Modified :

Oct. 13, 2025, 2:15 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-39965 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 resolved Linux kernel patch to prevent use-after-free vulnerabilities.
  • Update the Linux kernel to the latest secure version.
  • Rebuild and deploy the kernel with the fix.
  • Verify the patch is applied successfully.
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-2025-39965.

URL Resource
https://git.kernel.org/stable/c/0baf92d0b1590b903c1f4ead75e61715e50e8146
https://git.kernel.org/stable/c/9fcedabaae0096f712bbb4ccca6a8538af1cd1c8
https://git.kernel.org/stable/c/a78e55776522373c446f18d5002a8de4b09e6bf7
https://git.kernel.org/stable/c/cd8ae32e4e4652db55bce6b9c79267d8946765a9
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39965 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-2025-39965 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-2025-39965 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-2025-39965 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. 13, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: xfrm: xfrm_alloc_spi shouldn't use 0 as SPI x->id.spi == 0 means "no SPI assigned", but since commit 94f39804d891 ("xfrm: Duplicate SPI Handling"), we now create states and add them to the byspi list with this value. __xfrm_state_delete doesn't remove those states from the byspi list, since they shouldn't be there, and this shows up as a UAF the next time we go through the byspi list.
    Added Reference https://git.kernel.org/stable/c/0baf92d0b1590b903c1f4ead75e61715e50e8146
    Added Reference https://git.kernel.org/stable/c/9fcedabaae0096f712bbb4ccca6a8538af1cd1c8
    Added Reference https://git.kernel.org/stable/c/a78e55776522373c446f18d5002a8de4b09e6bf7
    Added Reference https://git.kernel.org/stable/c/cd8ae32e4e4652db55bce6b9c79267d8946765a9
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.