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CVE-2025-40283: Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-06 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF There is a KASAN: slab-use-after-free read in btusb_disconnect(). Calling "usb_driver_release_interface(&btusb_driver, data->intf)" will free the btusb data associated with the interface. The same data is then used later in the function, hence the UAF. Fix by moving the accesses to btusb data to before the data is free'd.

Affected products

• Linux kernel: 4.11 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1c28c1e1522c773a94e26950ffb145e88cd9834b
• https://git.kernel.org/stable/c/23d22f2f71768034d6ef86168213843fc49bf550
• https://git.kernel.org/stable/c/297dbf87989e09af98f81f2bcb938041785557e8
• https://git.kernel.org/stable/c/5dc00065a0496c36694afe11e52a5bc64524a9b8
• https://git.kernel.org/stable/c/7a6d1e740220ff9dfcb6a8c994d6ba49e76db198
• https://git.kernel.org/stable/c/95b9b98c93b1c0916a3d4cf4540b7f5d69145a0d
• https://git.kernel.org/stable/c/a2610ecd9fd5708be8997ca8f033e4200c0bb6af
• https://git.kernel.org/stable/c/f858f004bc343a7ae9f2533bbb2a3ab27428532f

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