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

batman-adv: bla: avoid NULL-ptr deref for claim via dropped interface

Without rtnl_lock held, a hardif might be retrieved as primary interface of
a meshif, but then (while operating on this interface) getting decoupled
from the mesh interface. In this case, the meshif still exists but the
pointer from the primary hardif to the meshif is set to NULL.

The mesh_iface must be checked first to be non-NULL before continuing to
send an ARP request using meshif.

https://git.kernel.org/stable/c/0f3ebd7bb417aabc44853cc7c2a184ebb0e05b45

https://git.kernel.org/stable/c/2a8c9e86529156c62d9187b9ed9454c31665ad33

https://git.kernel.org/stable/c/4f6266735a0ba6a568b6d4c9fa51c33a5a7f2d70

https://git.kernel.org/stable/c/53cb3511f6eda37d3bd923545fdba6013b6d7bb7

https://git.kernel.org/stable/c/555b8d3f5c313d81d46274fd0976352dafc80124

https://git.kernel.org/stable/c/6921a7683ae9ad0208d829e71f725a9e25ccff49

https://git.kernel.org/stable/c/efb62458c94db1fe3a287e7e89c31b0cfb03f938

https://git.kernel.org/stable/c/f80d3d98d2ff78d9e2fe5d68b1f45948c4f7bd24

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