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 :
Jan. 23, 2026, 8:03 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- 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.
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.
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.
-
Initial Analysis by [email protected]
Jan. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.49 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.194 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.245 *cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.16.9 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.108 *cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.154 Added Reference Type kernel.org: https://git.kernel.org/stable/c/00e98b5a69034b251bb36dc6e7123d7648e218e4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/14c231959a16ca41bfdcaede72483362a8c645d7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4f364023ddcfe83f7073b973a9cb98584b7f2a46 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5e94e44c9cb30d7a383d8ac227f24a8c9326b770 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/aaf900a83508c8cd5cdf765e7749f9076196ec7f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c2ff91255e0157b356cff115d8dc3eeb5162edf2 Types: Patch -
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