CVE-2026-90254

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths adv_timeout_expire() hands a kmalloc()ed instance byte to hci_cmd_sync_queue() with a NULL destroy callback, and only adv_timeout_expire_sync() frees it. That leaks on two paths: - the return value is not checked, and hci_cmd_sync_queue() does not take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM); - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry() does not free entry->data when there is no destroy callback. hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. Free the buffer from a destroy callback, and in the caller when the entry could not be queued at all.

• https://git.kernel.org/stable/c/120d8dc042e3d45073bb6e50ee7b058a0b182627
• https://git.kernel.org/stable/c/193182c6467f508a8a61d5db506d796ffed6eee6
• https://git.kernel.org/stable/c/2e3d827cd56865c14f6ca118bbccd7801091fb21
• https://git.kernel.org/stable/c/9c3b6c1413bd0b4993642d987616331f84d9b7f5
• https://git.kernel.org/stable/c/bb5ca1cc7744c41c59002bd6523714a685ae6595
• https://git.kernel.org/stable/c/c2019224a766245b7db39d87fdfe84c3fdc879d9