CVE-2026-97908
UnknownSummary
In the Linux kernel, in Bluetooth: btqcomsmd, the teardown order is incorrect: hci_dev is freed before destroying the RPMsg endpoints. If WCNSS delivers data in that window, the callback can run with an already freed hci_dev.
Risk Assessment
Use-after-free may lead to security breaches, system crashes, or unpredictable Bluetooth driver behavior.
Recommendation
Destroy the RPMsg endpoints before calling hci_free_dev(), and in the remove path call hci_unregister_dev() first.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btqcomsmd: destroy RPMsg endpoints before freeing hci_dev The command and ACL RPMsg endpoints store struct btqcomsmd as their callback private data. The receive callbacks dereference btq->hdev without taking an hci_dev reference. The current teardown order frees the hci_dev before destroying the RPMsg endpoints in both the hci_register_dev() error path and the driver remove path. If WCNSS delivers data in that window, the endpoint callback can run with an already freed hci_dev and pass it to the Bluetooth core. For qcom_smd endpoints, rpmsg_destroy_ept() closes the channel and clears the callback under the channel recv_lock. The receive path holds the same lock while invoking the callback, so destroying the endpoints first both prevents new callbacks and serializes with any callback already running. Destroy the command and ACL endpoints before hci_free_dev(). Keep hci_unregister_dev() first during remove so the HCI core stops issuing operations before the transport endpoints are shut down. In the full registration-error cleanup path, return directly after freeing the hci_dev to avoid falling through to the partial-construction labels and destroying the endpoints twice.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS