CVE-2026-68320

Description

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.

References

• https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0
• https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48
• https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12
• https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255
• https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9