In the Linux kernel, the following vulnerability has been resolved: mctp i2c: handle NULL header address daddr can be NULL if there is no neighbour table entry present, in that case the tx packet should be dropped. saddr will usually be set by MCTP core, but check for NULL in case a packet is transmitted by a different protocol.
https://git.kernel.org/stable/c/8e886e44397ba89f6e8da8471386112b4f5b67b7
https://git.kernel.org/stable/c/8c222adadc1612e4f097688875962a28e3f5ab44
https://git.kernel.org/stable/c/4707893315802a0917231b94cb20cbe50ccbfe03
https://git.kernel.org/stable/c/01e215975fd80af81b5b79f009d49ddd35976c13