title: xenstored: A transaction conflict can crash C Xenstored
description: When a transaction is committed, C Xenstored will first check
the quota is correct before attempting to commit any nodes.  It would
be possible that accounting is temporarily negative if a node has
been removed outside of the transaction.
Unfortunately, some versions of C Xenstored are assuming that the
quota cannot be negative and are using assert() to confirm it.  This
will lead to C Xenstored crash when tools are built without -DNDEBUG
(this is the default).
affected:
{
defaultStatus: unknown
product: Xen
vendor: Xen
versions:
status: unknown, version: consult Xen advisory XSA-440
}
workarounds: The problem can be avoided by using OCaml Xenstored variant.