Bug 2396933 (CVE-2025-39861)

Summary: CVE-2025-39861 kernel: Bluetooth: vhci: Prevent use-after-free by removing debugfs files early
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-19 16:02:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: vhci: Prevent use-after-free by removing debugfs files early

Move the creation of debugfs files into a dedicated function, and ensure
they are explicitly removed during vhci_release(), before associated
data structures are freed.

Previously, debugfs files such as "force_suspend", "force_wakeup", and
others were created under hdev->debugfs but not removed in
vhci_release(). Since vhci_release() frees the backing vhci_data
structure, any access to these files after release would result in
use-after-free errors.

Although hdev->debugfs is later freed in hci_release_dev(), user can
access files after vhci_data is freed but before hdev->debugfs is
released.
Comment 1 Jon Moroney 2025-09-19 16:51:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091906-CVE-2025-39861-5ba5@gregkh/T