CVE-2026-68320

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

sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the

capacity limit for ep->auth_chunk_list, allowing it to hold up to

20 chunk entries (param_hdr.length up to 24). However, the copy

destination asoc->c.auth_chunks in struct sctp_cookie is only

SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16

chunks are added, sctp_association_init() memcpy overflows the

destination by up to 4 bytes.

Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching

the destination capacity.