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CVE-2025-39951
um: virtio_uml: Fix use-after-free after put_device in probe
Description

In the Linux kernel, the following vulnerability has been resolved: um: virtio_uml: Fix use-after-free after put_device in probe When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues.

INFO

Published Date :

Oct. 4, 2025, 8:15 a.m.

Last Modified :

Oct. 6, 2025, 2:56 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-39951 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 kernel patches to fix use-after-free vulnerabilities in virtio_uml.
  • Update the Linux kernel to a patched version.
  • Review virtio_uml driver code for similar issues.
  • Test the system after applying the patch.
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-2025-39951.

URL Resource
https://git.kernel.org/stable/c/00e98b5a69034b251bb36dc6e7123d7648e218e4
https://git.kernel.org/stable/c/14c231959a16ca41bfdcaede72483362a8c645d7
https://git.kernel.org/stable/c/4f364023ddcfe83f7073b973a9cb98584b7f2a46
https://git.kernel.org/stable/c/5e94e44c9cb30d7a383d8ac227f24a8c9326b770
https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0
https://git.kernel.org/stable/c/aaf900a83508c8cd5cdf765e7749f9076196ec7f
https://git.kernel.org/stable/c/c2ff91255e0157b356cff115d8dc3eeb5162edf2
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39951 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-2025-39951 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-2025-39951 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-2025-39951 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. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: um: virtio_uml: Fix use-after-free after put_device in probe When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues.
    Added Reference https://git.kernel.org/stable/c/00e98b5a69034b251bb36dc6e7123d7648e218e4
    Added Reference https://git.kernel.org/stable/c/14c231959a16ca41bfdcaede72483362a8c645d7
    Added Reference https://git.kernel.org/stable/c/4f364023ddcfe83f7073b973a9cb98584b7f2a46
    Added Reference https://git.kernel.org/stable/c/5e94e44c9cb30d7a383d8ac227f24a8c9326b770
    Added Reference https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0
    Added Reference https://git.kernel.org/stable/c/aaf900a83508c8cd5cdf765e7749f9076196ec7f
    Added Reference https://git.kernel.org/stable/c/c2ff91255e0157b356cff115d8dc3eeb5162edf2
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.