Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: annotate data-races around hdev->req_status __hci_cmd_sync_sk() sets hdev->req_status under hdev->req_lock: hdev->req_status = HCI_REQ_PEND; However, several other functions read or write hdev->req_status without holding any lock: - hci_send_cmd_sync() reads req_status in hci_cmd_work (workqueue) - hci_cmd_sync_complete() reads/writes from HCI event completion - hci_cmd_sync_cancel() / hci_cmd_sync_cancel_sync() read/write - hci_abort_conn() reads in connection abort path Since __hci_cmd_sync_sk() runs on hdev->req_workqueue while hci_send_cmd_sync() runs on hdev->workqueue, these are different workqueues that can execute concurrently on different CPUs. The plain C accesses constitute a data race. Add READ_ONCE()/WRITE_ONCE() annotations on all concurrent accesses to hdev->req_status to prevent potential compiler optimizations that could affect correctness (e.g., load fusing in the wait_event condition or store reordering).
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f80c5dad7b6467b884c445ffea45985793b4b2d0 before e51042ddc0b20d9bda5eb6dcf85a2668f9c5dae4; affected f80c5dad7b6467b884c445ffea45985793b4b2d0 before 6e539907c0d11f514c5e0b049b27b04dff48a5b1; affected f80c5dad7b6467b884c445ffea45985793b4b2d0 before a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27; affected f80c5dad7b6467b884c445ffea45985793b4b2d0 before 40734ce8efc34c4a0d0222855798c0dc14b65f2e; affected f80c5dad7b6467b884c445ffea45985793b4b2d0 before b6807cfc195ef99e1ac37b2e1e60df40295daa8c; affected 8603d49906b231bbcd9141db7d096fa1041bc379; affected 0e061885bfcd65ef5d09f154f3c3c3491cc7544a; affected a3d50fb7ce931f08a2c6194fdc4c9a56c9ed4153; affected 4.19.47 before 4.20; affected 5.0.20 before 5.1; affected 5.1.6 before 5.2 |
| Linux / Linux | affected 5.2; unaffected 0 before 5.2; unaffected 6.6.145 through 6.6.*; unaffected 6.12.83 through 6.12.*; unaffected 6.18.24 through 6.18.*; unaffected 6.19.14 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/e51042ddc0b20d9bda5eb6dcf85a2668f9c5dae4
- https://git.kernel.org/stable/c/6e539907c0d11f514c5e0b049b27b04dff48a5b1
- https://git.kernel.org/stable/c/a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27
- https://git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e
- https://git.kernel.org/stable/c/b6807cfc195ef99e1ac37b2e1e60df40295daa8c