GHSA-9w9h-x3fh-m3fp: NULL pointer dereference in the BSD raw IPv6 send path when the destination table is full
In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, built with BSD raw socket and IPv6 support, the IPv6 raw send path uses the destination-table entry it adds without checking that the add succeeded. When the destination table is full and an off-link destination is reached through a default router whose neighbour cache entry is unknown, sending on an IPv6 raw socket with header inclusion dereferences a NULL pointer; a remote sender can fill the table, for example with ICMPv6 Packet Too Big messages, and crash the sending thread.
Event History
Frequently Asked Questions
Which deployments are affected?
Affected deployments use Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a and are built with both BSD raw socket support and IPv6 support.
What conditions are required to trigger the crash?
The destination table must be full, the target must be an off-link IPv6 destination reached through a default router with an unknown neighbour-cache entry, and a packet must be sent on an IPv6 raw socket with header inclusion enabled.
Can this be triggered remotely?
Yes. A remote sender can fill the destination table, for example by sending ICMPv6 Packet Too Big messages, and cause the sending thread to crash when the vulnerable send path is reached.
What is the practical impact?
The NULL pointer dereference crashes the sending thread, creating an availability impact for the affected networking operation.