CVE-2026-97977

CVE CVE-2026-97977EUVD EUVD-2026-86631Published 2026-09-25T10:23:15.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: Fix UAF of btusb_data by rx_work btusb_close() and btusb_flush() cancel data->rx_work with the asynchronous cancel_delayed_work(), so if btusb_rx_work() is already running on another CPU it keeps running after the cancel returns. btusb_disconnect() calls hci_unregister_dev(), which invokes btusb_close(), and then frees the btusb_data. A still running btusb_rx_work() then dereferences the freed data: while ((skb = skb_dequeue(&data->acl_q))) data->recv_acl(data->hdev, skb); Use cancel_delayed_work_sync() instead. In btusb_close() the cancel also has to happen after btusb_stop_traffic(), otherwise an URB completion racing with the cancel can requeue the work right after it has been waited for.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5.17; patch: 7.3-rc3; patch: 7.2.7; 800fe5ec302e1ebbf5e3f891f886deecd49c7132 <93b59937bda3fffc6386c79f5544a39bc680c8e8; patch: 6.18.53; 800fe5ec302e1ebbf5e3f891f886deecd49c7132 <1c12c3117639e78940959d956519c758c57d0849; 800fe5ec302e1ebbf5e3f891f886deecd49c7132 <472d005622525b7be155cac99dde2252b0163bd1; patch: 6.12.111; patch: 0; 800fe5ec302e1ebbf5e3f891f886deecd49c7132 <fa391adb9c755515a89993634745e9079e5ef37c

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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