CVE-2026-23557

Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES

command within a transaction due to an assert() triggering.

In case xenstored was built with NDEBUG #defined nothing bad will

happen, as assert() is doing nothing in this case. Note that the

default is not to define NDEBUG for xenstored builds even in release

builds of Xen.