A flaw was found in the libvirt nwfilter driver. The virNWFilterObjListNumOfNWFilters method failed to acquire the 'driver->nwfilters' mutex before iterating over virNWFilterObj instances. There was no protection to stop another thread from concurrently modifying the 'driver->nwfilters' object. This flaw allows a malicious, unprivileged user to exploit this issue via libvirt’s API virConnectNumOfNWFilters to crash the network filter management daemon (libvirtd/virtnwfilterd). https://nvd.nist.gov/vuln/detail/CVE-2022-0897
