CVE-2026-53225

Technical Description

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

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References