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

ipvs: use parsed transport offset in SCTP state lookup

set_sctp_state() reads the SCTP chunk header again in order to drive the
IPVS SCTP state table. For IPv6 it computes the offset with
sizeof(struct ipv6hdr), while the surrounding IPVS code uses iph.len from
ip_vs_fill_iph_skb(), where ipv6_find_hdr() has already skipped
extension headers and found the real transport header.

This makes the state machine read from the wrong offset for IPv6 SCTP
packets that carry extension headers. For example, an INIT packet with an
8-byte destination options header can be scheduled correctly by
sctp_conn_schedule(), but set_sctp_state() reads the first byte of the
SCTP verification tag as a DATA chunk type. The connection then moves
from NONE to ESTABLISHED instead of INIT1, gets the longer established
timeout, and updates the active/inactive destination counters
incorrectly. This happens even though the SCTP handshake has not
completed.

Use the parsed transport offset passed down from ip_vs_set_state() for
the SCTP chunk-header lookup. For IPv4 and IPv6 packets without
extension headers this preserves the existing offset.

https://git.kernel.org/stable/c/247d055504dcc852e539b9f7f30d19f9741474bf

https://git.kernel.org/stable/c/290e9e8389b556efc603522e28bd1543846aa336

https://git.kernel.org/stable/c/2f75c0faa3361b28e36cc0512b3299e163e25789

https://git.kernel.org/stable/c/9cb5ac594ca76d3a71803b23b74c835b0721e628

https://git.kernel.org/stable/c/9f94573ab962a9e81954b755da016fa3cd2f5039

https://git.kernel.org/stable/c/a4a2d2e483d79cc2ad3a170674cf159644acf22b

https://git.kernel.org/stable/c/d2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27

https://git.kernel.org/stable/c/e5d0bb8871668f20de8f3c94b5ae3f372346bc6e

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