CVE-2026-98456

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: mgmt: fix race in read unconf index list()

read unconf index list() counts unconfigured controllers before allocating its response, then checks the device flags again while filling it.

hci dev list lock stabilizes list membership, but it does not serialize the per-device flags. During asynchronous controller setup, the worker can set HCI UNCONFIGURED and clear HCI SETUP between the two passes. A controller omitted from the allocation count can then become eligible for the fill pass, causing an out-of-bounds write to rp->index[].

Allocate space for every device on hci dev list. Since list membership cannot change while hci dev list lock is held, the response remains large enough regardless of flag transitions. The reported count and response length still include only eligible unconfigured controllers.