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

batman-adv: tt: fix TOCTOU race for reported vlans

The local TT based TVLV is generated by first checking the number of VLANs
which have at least one TT entry. A new buffer with the correct size for
the VLANs is then allocated. Only then, the list of VLANs s used to fill
the VLAN entries in the buffer. During this time, the meshif_vlan_list_lock
is held. But the actual number of TT entries of each VLAN can still
increase during this time - just not the number of VLANs in the list.

But the prefilter used in the buffer size calculation might still cause an
increase of the number of VLANs which need to be stored. Simply because a
VLAN might now suddenly have at least one entry when it had none in the
pre-alloc check - and then needs to occupy space which was not allocated.

It is better to overestimate the buffer size at the beginning and then fill
the buffer only with the VLANs which are not empty.

https://git.kernel.org/stable/c/211ea59988e1cba43cb0367ad65d379b56f9c3bd

https://git.kernel.org/stable/c/4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f

https://git.kernel.org/stable/c/65a1e67339aa8c95ac544b796946af388930ee23

https://git.kernel.org/stable/c/724a8eb4155669797c96b70d70e354284ae3b5a8

https://git.kernel.org/stable/c/94d27005016be15ffc638b2ecbc4d58805ad7b48

https://git.kernel.org/stable/c/9a9c859457bc440a55773e01ff18b1bb5bab6836

https://git.kernel.org/stable/c/b4d4efd4e351593c81e9293d4b4408d244fa5ee7

https://git.kernel.org/stable/c/e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b

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