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

batman-adv: mcast: fix use-after-free in orig_node RCU release

batadv_mcast_purge_orig() removes entries from RCU-protected hlists but
does not wait for an RCU grace period before returning. Concurrent RCU
readers may still accesses references to those entries at the point of
removal. RCU-protected readers trying to operate on entries like
orig->mcast_want_all_ipv6_node will then access already freed memory.

Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(),
just before the call_rcu() invocation. This ensures RCU readers that were
active at purge time have drained before the orig_node memory is reclaimed.

https://git.kernel.org/stable/c/20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc

https://git.kernel.org/stable/c/70bcb678561f0fb58f33270fc73f12f3be72b878

https://git.kernel.org/stable/c/78a63fb2f7d5630d1c1f2859a20d4e4226863b41

https://git.kernel.org/stable/c/8a3707653ab658e082ccd992e92594e01b09a3fc

https://git.kernel.org/stable/c/aef897c9d2dd0d9339167fb82b62beff68d076cb

https://git.kernel.org/stable/c/ced48f55bac73f0822eae90509e51b42b4f646c8

https://git.kernel.org/stable/c/edfb1e094104a50f931553dc82ac59246569fd32

https://git.kernel.org/stable/c/ff3a4487ead475e27b43280b8ee3d8464fe280e1

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