{"id":"CVE-2026-97977","title":"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_wor…","summary":"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_wor…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 800fe5ec302e1ebbf5e3f891f886deecd49c7132 < 472d005622525b7be155cac99dde2252b0163bd1","Linux >= 800fe5ec302e1ebbf5e3f891f886deecd49c7132 < 93b59937bda3fffc6386c79f5544a39bc680c8e8","Linux >= 800fe5ec302e1ebbf5e3f891f886deecd49c7132 < fa391adb9c755515a89993634745e9079e5ef37c","Linux >= 800fe5ec302e1ebbf5e3f891f886deecd49c7132 < 1c12c3117639e78940959d956519c758c57d0849","Linux 5.17"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:25.680","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97977","references":[{"url":"https://git.kernel.org/stable/c/1c12c3117639e78940959d956519c758c57d0849","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/472d005622525b7be155cac99dde2252b0163bd1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/93b59937bda3fffc6386c79f5544a39bc680c8e8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fa391adb9c755515a89993634745e9079e5ef37c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.869Z","slug":"CVE-2026-97977","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}