CVE-2022-50339 (GCVE-0-2022-50339)
Vulnerability from cvelistv5
Published
2025-09-16 16:11
Modified
2026-05-11 19:17
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev() syzbot is again reporting attempt to cancel uninitialized work at mgmt_index_removed() [1], for setting of HCI_MGMT flag from mgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can race with testing of HCI_MGMT flag from mgmt_index_removed() from hci_sock_bind() due to lack of serialization via hci_dev_lock(). Since mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can safely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and hci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag after INIT_DELAYED_WORK() completed. This is a local fix based on mgmt_chan_list_lock. Lack of serialization via hci_dev_lock() might be causing different race conditions somewhere else. But a global fix based on hci_dev_lock() should deserve a future patch.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3f2893d3c142986aa935821460cb3adb77044722
Version: 3f2893d3c142986aa935821460cb3adb77044722
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev()\n\nsyzbot is again reporting attempt to cancel uninitialized work\nat mgmt_index_removed() [1], for setting of HCI_MGMT flag from\nmgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can\nrace with testing of HCI_MGMT flag from mgmt_index_removed() from\nhci_sock_bind() due to lack of serialization via hci_dev_lock().\n\nSince mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can\nsafely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and\nhci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag\nafter INIT_DELAYED_WORK() completed.\n\nThis is a local fix based on mgmt_chan_list_lock. Lack of serialization\nvia hci_dev_lock() might be causing different race conditions somewhere\nelse. But a global fix based on hci_dev_lock() should deserve a future\npatch."
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