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

sctp: fix race between sctp_wait_for_connect and peeloff

sctp_wait_for_connect() drops and re-acquires the socket lock while
waiting for the association to reach ESTABLISHED state. During this
window, another thread can peeloff the association to a new socket via
getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After
re-acquiring the old socket lock, sctp_wait_for_connect() returns
success without noticing the migration — the caller then accesses
the association under the wrong lock in sctp_datamsg_from_user().

Add the same sk != asoc->base.sk check that sctp_wait_for_sndbuf()
already has, returning an error if the association was migrated while
we slept.

https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d

https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb

https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb

https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e

https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21

https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549

https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5

https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e

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