{"id":"CVE-2026-97977","published":"2026-09-25T11:17:25.680","lastModified":"2026-09-25T11:17:25.680","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: Fix UAF of btusb_data by rx_work\n\nbtusb_close() and btusb_flush() cancel data->rx_work with the\nasynchronous cancel_delayed_work(), so if btusb_rx_work() is already\nrunning on another CPU it keeps running after the cancel returns.\n\nbtusb_disconnect() calls hci_unregister_dev(), which invokes\nbtusb_close(), and then frees the btusb_data. A still running\nbtusb_rx_work() then dereferences the freed data:\n\n\twhile ((skb = skb_dequeue(&data->acl_q)))\n\t\tdata->recv_acl(data->hdev, skb);\n\nUse cancel_delayed_work_sync() instead. In btusb_close() the cancel also\nhas to happen after btusb_stop_traffic(), otherwise an URB completion\nracing with the cancel can requeue the work right after it has been\nwaited for.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/1c12c3117639e78940959d956519c758c57d0849","tags":[]},{"url":"https://git.kernel.org/stable/c/472d005622525b7be155cac99dde2252b0163bd1","tags":[]},{"url":"https://git.kernel.org/stable/c/93b59937bda3fffc6386c79f5544a39bc680c8e8","tags":[]},{"url":"https://git.kernel.org/stable/c/fa391adb9c755515a89993634745e9079e5ef37c","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}