CVE-2026-64092

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

batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown

The receiver shutdown timer handler, batadv_tp_receiver_shutdown(), is

responsible for releasing the tp_vars reference it holds. However, the

existing logic for coordinating this release with batadv_tp_stop_all() was

flawed.

timer_shutdown_sync() guarantees the timer will not fire again after it

returns, but it returns non-zero only when the timer was pending at the

time of the call. If the timer had already expired (and

batadv_tp_stop_all() would unsucessfully try to rearm itself),

batadv_tp_stop_all() skips its batadv_tp_vars_put(), and

batadv_tp_receiver_shutdown() fails to put its own reference as well.

Fix this by introducing a new atomic variable receiving that is set to 1

when the receiver is initialized and cleared atomically with atomic_xchg()

by whichever side claims it first. Only the side that observes the

transition from 1 to 0 is responsible for releasing the tp_vars timer

reference, eliminating the uncertainty.