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

ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()

In vti6_tnl_lookup(), when an exact match for a tunnel fails,
the code falls back to searching for wildcard tunnels:

- Tunnels matching the packet's local address, with any remote address
  wildcard remote).

- Tunnels matching the packet's remote address, with any local address
  (wildcard local).

However, vti6 stores all these different types of tunnels in the same
hash table (ip6n->tnls_r_l) prone to hash collisions.

The bug is that the fallback search loops in vti6_tnl_lookup() were
missing checks to ensure that the candidate tunnel actually has
a wildcard address.

https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b

https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d

https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646

https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d

https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9

https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6

https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1

https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8

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