Thank you for using Ubuntu and taking the time to report a bug. While you are correct that this issue is more than a DoS, we normally do not update USN text based on new exploit information (it is way too time-consuming and would remain hopelessly out of date). Additionally, while incomplete, the USN currently describes a high impact vulnerability for users of SCTP (a remotely triggerable DoS) which would compel SCTP users to upgrade their kernels anyway.
Thank you for using Ubuntu and taking the time to report a bug. While you are correct that this issue is more than a DoS, we normally do not update USN text based on new exploit information (it is way too time-consuming and would remain hopelessly out of date). Additionally, while incomplete, the USN currently describes a high impact vulnerability for users of SCTP (a remotely triggerable DoS) which would compel SCTP users to upgrade their kernels anyway.