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

sctp: purge outqueue on stale COOKIE-ECHO handling

sctp_stream_update() is only invoked when the association is moved into
COOKIE_WAIT during association setup/reconfiguration. In this path, the
outbound stream scheduler state (stream->out_curr) is expected to be
clean, since no user data should have been transmitted yet unless the
state machine has already partially progressed.

However, a corner case exists in sctp_sf_do_5_2_6_stale(): when a
Stale Cookie ERROR is received, the association is rolled back from
COOKIE_ECHOED to COOKIE_WAIT. In this scenario, user data may already
have been queued and even bundled with the COOKIE-ECHO chunk.

During the rollback, sctp_stream_update() frees the old stream table
and installs a new one, but it does not invalidate stream->out_curr.
As a result, out_curr may still point to a freed sctp_stream_out
entry from the previous stream state.

Later, SCTP scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on
stream->out_curr->ext, which can lead to use-after-free once the old
stream state has been released via sctp_stream_free().

This results in crashes such as (reported by Yuqi):

  BUG: KASAN: slab-use-after-free in sctp_sched_fcfs_dequeue+0x13a/0x140
  Read of size 8 at addr ff1100004d4d3208 by task mini_poc/9312
  CPU: 1 UID: 1001 PID: 9312 Comm: mini_poc Not tainted
     7.1.0-rc1-00305-gbd3a4795d574 #5 PREEMPT(full)
   sctp_sched_fcfs_dequeue+0x13a/0x140
   sctp_outq_flush+0x1603/0x33e0
   sctp_do_sm+0x31c9/0x5d30
   sctp_assoc_bh_rcv+0x392/0x6f0
   sctp_inq_push+0x1db/0x270
   sctp_rcv+0x138d/0x3c10

Fix this by fully purging the association outqueue when handling the
Stale Cookie case. This ensures all pending transmit and retransmit
state is dropped, and any scheduler cached pointers are invalidated,
making it safe to rebuild stream state during COOKIE_WAIT restart.

Updating only stream->out_curr would be insufficient, since queued
and retransmittable data would still reference the old stream state and
trigger later use-after-free in dequeue paths.

https://git.kernel.org/stable/c/1d4652f677906a64487c13f9ace54b0eb263b5d0

https://git.kernel.org/stable/c/2afc9e684dc7fecf73db1edc937ebbc47b4b68dc

https://git.kernel.org/stable/c/3c0741a441a7df7099d7ca6a64a6a0de09c677c8

https://git.kernel.org/stable/c/83ade59e5da365f4bf8bce72c5a38774202b442f

https://git.kernel.org/stable/c/84b7a319105db2f917ccdcf502bdc866082b1285

https://git.kernel.org/stable/c/a6207349e703cfc04756a4d16dec9176135813a5

https://git.kernel.org/stable/c/e374b22e9b07b72a25909621464ff74096151bfb

https://git.kernel.org/stable/c/f46e1d1a758878f0d22c4fbbd1bf42bb7165d1e8

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