Package: udev Version: 239-14 Followup-For: Bug #915261 Severity: serious Severity should be at least serious, for two reasons. First so it gets listed with apt-listbugs default levels and people can decide what to do. And second, it does not affect every user, but those affected have to handle a broken boot, which is not nice.
Per https://release.debian.org/testing/rc_policy.txt it is release critical. ---8<--- * makes unrelated software on the system (or the whole system) break --->8--- GSR