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

sctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks

sctp_getsockopt_peer_auth_chunks() checks that the caller's optval
buffer is large enough for the peer AUTH chunk list with

    if (len < num_chunks)
            return -EINVAL;

but then writes num_chunks bytes to p->gauth_chunks, which lives
at offset offsetof(struct sctp_authchunks, gauth_chunks) == 8
inside optval.  The check is missing the sizeof(struct
sctp_authchunks) = 8-byte header.  When the caller supplies
len == num_chunks (for any num_chunks > 0) the test passes but
copy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes
past the declared buffer.

The sibling function sctp_getsockopt_local_auth_chunks() at the
next line already has the correct check:

    if (len < sizeof(struct sctp_authchunks) + num_chunks)
            return -EINVAL;

Align the peer variant with its sibling.

Reproducer confirms on v7.0-13-generic: an unprivileged userspace
caller that opens a loopback SCTP association with AUTH enabled,
queries num_chunks with a short optval, then issues the real
getsockopt with len == num_chunks and sentinel bytes painted past
the buffer observes those sentinel bytes overwritten with the
peer's AUTH chunk type.  The bytes written are under the peer's
control but land in the caller's own userspace; this is not a
kernel memory corruption, but it is a kernel-side contract
violation that can silently corrupt adjacent userspace data.

https://git.kernel.org/stable/c/0cf004ffb61cd32d140531c3a84afe975f9fc7ea

https://git.kernel.org/stable/c/2b5a2c957c7769d40110f725cf23987fcef50d75

https://git.kernel.org/stable/c/6849b995cda88a677bf08a05765d1db7905974fc

https://git.kernel.org/stable/c/6bcf8fe4ef7967b22b814cbae9a57bbd3c853410

https://git.kernel.org/stable/c/70a089cc9590aa347a61e84434116ab74619e3c3

https://git.kernel.org/stable/c/a132e199de69e2a45628aa8534df1bf5d44e1b6e

https://git.kernel.org/stable/c/d45c7e99caf915b0f6c716bd8ffe9d45b9685761

https://git.kernel.org/stable/c/d67fbc6dea5dbf7f46c618ebf65910a276078e20

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