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

sctp: validate Adaptation Indication parameter length

The Adaptation Layer Indication parameter contains a fixed 32-bit Adaptation Code Point after its parameter header. However, sctp verify param() accepts a header-only parameter because the generic parameter walker only requires the header to be present.

sctp process param() then reads adaptation ind beyond the declared parameter. When the malformed parameter is last in an INIT, the read starts at the receive skb tail, and the value is copied into the state cookie returned in the INIT ACK. This may disclose four receive-buffer tail bytes.

Require the declared parameter length to match the fixed structure size and abort the association through the existing invalid parameter length path otherwise.