CVE-2026-68085

Summary

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_uart: clear HCI_UART_SENDING when write_work is canceled

HCI_UART_SENDING bit in tx_state means write_work is pending and blocks queueing it again. Currently this bit is not cleared when canceling the work in hci_uart_close(), which blocks future writes when device is reopened later if write_work was pending.

Fix by clearing HCI_UART_SENDING when canceling the work.

Also make clearing of tx_skb safe by using disable_work_sync + enable_work instead of just cancel_work_sync. hci_uart_flush() purges the proto tx queue so we can cancel the pending write_work there, instead of doing it just in hci_uart_close(). Re-enable and possibly requeue the work after queue flush.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux81c7a3c22a0f2808cf4ae0b4908f59763b23606d < d52446b3e735cfdbdc2a58342163803bc2e64249affected
LinuxLinux192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894 < b9dd39cf1667e378b25a082ca796d495d578c5d3affected
LinuxLinuxc1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b < 714d861d35d937f23375a4517569b13917bbbe51affected
LinuxLinuxc1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b < 1b0d946d6f08bd39211385bc703a440911b41e46affected
LinuxLinux78aad93e938f013d9272fe0ee168f27883afa95caffected
LinuxLinuxe2d19969c8d9198ecc3090bcd5312ecd503a3339affected
LinuxLinuxc85cff648a2bc92322912db5f1727ad05afae7b6affected
LinuxLinux9d20d48be2c4a071fb015eb09bda2cecd25daf34affected
LinuxLinux7338031946bd06f6dff149e67b60c4cd083bfea8affected
LinuxLinux6.12.92 < 6.12.96affected
LinuxLinux6.18.34 < 6.18.39affected
LinuxLinux5.10.258 < 5.11affected
LinuxLinux5.15.209 < 5.16affected
LinuxLinux6.1.175 < 6.2affected
LinuxLinux6.6.142 < 6.7affected
LinuxLinux7.0.11 < 7.1affected
LinuxLinux7.1affected
LinuxLinux0 < 7.1unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc3 <= *unaffected

Weaknesses

References