Bug 2401410 (CVE-2025-39951)

Summary: CVE-2025-39951 kernel: um: virtio_uml: Fix use-after-free after put_device in probe
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-04 08:01:33 UTC 
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.
Comment 1 Jon Moroney 2025-10-06 16:27:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100420-CVE-2025-39951-24b1@gregkh/T