CVE-2025-39951: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.5, before 5.10.245 (fixed in 5.10.245); from 5.11, before 5.15.194 (fixed in 5.15.194); from 5.16, before 6.1.154 (fixed in 6.1.154); from 6.2, before 6.6.108 (fixed in 6.6.108); from 6.7, before 6.12.49 (fixed in 6.12.49); from 6.13, before 6.16.9 (fixed in 6.16.9); …

Published 2025-10-04. Last modified 2026-07-30.