Linux EUVD-2026-59312

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

sctp: fix err_chunk memory leaks in INIT handling

When sctp_verify_init() encounters unrecognized parameters, it allocates an err_chunk to report them. However, this chunk is leaked in several code paths:

1. In sctp_sf_do_5_1B_init(), if security_sctp_assoc_request() fails after

sctp_verify_init() has populated err_chunk, the function returns immediately without freeing it.

1. In sctp_sf_do_unexpected_init(), the same leak occurs on the

security_sctp_assoc_request() failure path.

1. In sctp_sf_do_unexpected_init(), on the success path after copying

unrecognized parameters to the INIT-ACK, the function returns without freeing err_chunk, unlike sctp_sf_do_5_1B_init() which properly frees it.

Fix all three leaks by adding sctp_chunk_free(err_chunk) calls before returning in the error paths and on the success path in sctp_sf_do_unexpected_init().