CVE-2026-98456Bluetooth: mgmt: fix race in read_unconf_index_list()

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/fa6f79bb0009406bb11e6912b53ab7c564d6f06b
• https://git.kernel.org/stable/c/76dc7e0297f6f7ebefc36a69251e3f4a676d9853
• https://git.kernel.org/stable/c/9c32455f490b960efccedd041c7aabb1a04c5cc4
• https://git.kernel.org/stable/c/524e0450dd9a396f99a81b045219b0e2ea0dab57
• https://git.kernel.org/stable/c/8ddf962c76432a10a6cb80042875cbc48a9c056b
• https://git.kernel.org/stable/c/416546cd6a54e9b68f2b91bc680b1ee17dcd77a1
• https://git.kernel.org/stable/c/2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1
• https://git.kernel.org/stable/c/b5dbb41b212c50c095a4dbee3017a84fe94f033b