CVE-2025-23142

/// Technical description

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

sctp: detect and prevent references to a freed transport in sendmsg

sctp_sendmsg() re-uses associations and transports when possible by

doing a lookup based on the socket endpoint and the message destination

address, and then sctp_sendmsg_to_asoc() sets the selected transport in

all the message chunks to be sent.

There's a possible race condition if another thread triggers the removal

of that selected transport, for instance, by explicitly unbinding an

address with setsockopt(SCTP_SOCKOPT_BINDX_REM), after the chunks have

been set up and before the message is sent. This can happen if the send

buffer is full, during the period when the sender thread temporarily

releases the socket lock in sctp_wait_for_sndbuf().

This causes the access to the transport data in

sctp_outq_select_transport(), when the association outqueue is flushed,

to result in a use-after-free read.

This change avoids this scenario by having sctp_tr

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References