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

netfilter: nft_tunnel: fix use-after-free on object destroy

nft_tunnel_obj_destroy() calls metadata_dst_free() which directly
kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets
that took a reference via dst_hold() in nft_tunnel_obj_eval() and
are still queued (e.g. in a netem qdisc) are left with a dangling
pointer. When these packets are eventually dequeued, dst_release()
operates on freed memory.

Replace metadata_dst_free() with dst_release() so the metadata_dst
is freed only after all references are dropped. The dst subsystem
already handles metadata_dst cleanup in dst_destroy() when
DST_METADATA is set.

https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05

https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef

https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82

https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842

https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3

https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a

https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43

https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e

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