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SCTPhantom is a use-after-free vulnerability in the Linux kernel's SCTP Dynamic Address Reconfiguration handling, specifically in ASCONF DEL-IP processing. During sctp_process_asconf(), the kernel caches the transport associated with the ASCONF chunk in asconf->transport. When an ASCONF is located through its Address Parameter, that cached transport can differ from the packet source address. A crafted ASCONF containing a DEL-IP for a non-source address followed by a wildcard DEL-IP can cause the first operation to remove and free the transport still referenced by asconf->transport, after which subsequent logic reuses the dangling pointer in SCTP association management paths such as sctp_assoc_set_primary() and sctp_assoc_del_nonprimary_peers(). This can dereference freed memory, corrupt association state, and leave primary_path and active_path pointing to freed transport structures. The vulnerable logic dates back to Linux 2.6.25.
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