CVE-2026-64093

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

batman-adv: tp_meter: directly shut down timer on cleanup

batadv_tp_sender_cleanup() was calling timer_delete_sync() followed by

timer_delete() to guard against the timer handler re-arming itself between

the two calls. This double-deletion hack relied on the sending status being

set to 0 to suppress re-arming.

Replace both calls with a single timer_shutdown_sync(). This function both

waits for any running timer callback to complete (like timer_delete_sync())

and permanently disarms the timer so it cannot be re-armed afterwards,

making re-arming prevention unconditional and self-documenting.

The re-arming property is also required because otherwise:

1. context 0 (batadv_tp_recv_ack()) checks in

batadv_tp_reset_sender_timer() if sending is still 1 -> it is

2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in

this process forces the kthread to stop timer in

batadv_tp_sender_cleanup()

3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the

timer -> but the reference for it is already gone