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Change History

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

netfilter: nf_conntrack_expect: use expect->helper

Use expect->helper in ctnetlink and /proc to dump the helper name.
Using nfct_help() without holding a reference to the master conntrack
is unsafe.

Use exp->master->helper in ctnetlink path if userspace does not provide
an explicit helper when creating an expectation to retain the existing
behaviour. The ctnetlink expectation path holds the reference on the
master conntrack and nf_conntrack_expect lock and the nfnetlink glue
path refers to the master ct that is attached to the skb.

https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0

https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417

https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781

https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817

https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306

https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d