CVE-2026-53225

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

sctp: fix uninit-value in __sctp_rcv_asconf_lookup()

__sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF

chunk can hold the ADDIP header and a parameter header, then calls

af->from_addr_param(), which reads the full address (16 bytes for IPv6)

trusting the parameter's declared length.

An unauthenticated peer can send a truncated trailing ASCONF chunk that

declares an IPv6 address parameter but stops after the 4-byte parameter

header; reached from the no-association lookup path, from_addr_param() then

reads uninitialized bytes past the parameter.

Impact: an unauthenticated SCTP peer makes the receive path read up to 16

bytes of uninitialized memory past a truncated ASCONF address parameter.

The sibling __sctp_rcv_init_lookup() bounds parameters with

sctp_walk_params(); this path open-codes the fetch and omits the bound.

Verify the whole address parameter lies within the chunk before

from_addr_param() reads it, the same class of fix as commit 51e5ad549c43

("net: sctp: fix KMSAN uninit-value in sctp_inq_pop").