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CVE-2025-40283

Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF

HIGH
7.8
CVSS Score
Published: December 6, 2025 at 09:51 PM UTC
Updated: October 15, 2026 at 10:19 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
4.11fd913ef7ce619467c6b0644af48ba1fec499c623
Vendor states this is fixed in 1c28c1e1522c773a94e26950ffb145e88cd9834b (fixed)
Vendor states this is fixed in 23d22f2f71768034d6ef86168213843fc49bf550 (fixed)
Vendor states this is fixed in 297dbf87989e09af98f81f2bcb938041785557e8 (fixed)
Vendor states this is fixed in 5dc00065a0496c36694afe11e52a5bc64524a9b8 (fixed)
Vendor states this is fixed in 7a6d1e740220ff9dfcb6a8c994d6ba49e76db198 (fixed)
Vendor states this is fixed in 95b9b98c93b1c0916a3d4cf4540b7f5d69145a0d (fixed)
Vendor states this is fixed in a2610ecd9fd5708be8997ca8f033e4200c0bb6af (fixed)
Vendor states this is fixed in f858f004bc343a7ae9f2533bbb2a3ab27428532f (fixed)
Vendor states this is fixed in 4.11 (unaffected)
Vendor states this is fixed in 5.10.247 (unaffected)
Vendor states this is fixed in 5.15.197 (unaffected)
Vendor states this is fixed in 5.4.302 (unaffected)
Vendor states this is fixed in 6.1.159 (unaffected)
Vendor states this is fixed in 6.12.59 (unaffected)
Vendor states this is fixed in 6.17.9 (unaffected)
Vendor states this is fixed in 6.18 (unaffected)
Vendor states this is fixed in 6.6.117 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (8)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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