CVE-2026-74688

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> sctp: clear control chunk transport if it is being removed<br /> <br /> sctp_make_heartbeat_ack() caches the destination transport in<br /> chunk-&gt;transport without taking a reference. When src_out_of_asoc_ok is<br /> enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead<br /> of being transmitted immediately.<br /> <br /> If the peer transport is removed while the chunk is still queued,<br /> sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing,<br /> but only clears cached transport pointers in out_chunk_list. The queued<br /> control chunk therefore retains a dangling transport pointer.<br /> <br /> Once an ASCONF_ACK clears the suppression and the queued control chunk is<br /> transmitted, SCTP dereferences the stale transport pointer, leading to a<br /> use-after-free.<br /> <br /> Fix this by also clearing chunk-&gt;transport for queued control chunks in<br /> control_chunk_list when removing the transport.