Bug 2419924 (CVE-2025-40283)

Summary:	CVE-2025-40283 kernel: Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A use-after-free was found in the btusb Bluetooth driver in the Linux kernel. In btusb_disconnect(), calling usb_driver_release_interface() frees the btusb data structure, but the code subsequently accesses fields from this freed structure, causing a use-after-free condition.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-08 07:09:16 UTC

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.

Comment 1 Jon Moroney 2025-12-08 19:17:14 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120718-CVE-2025-40283-0706@gregkh/T