A flaw was found in the RPC library APIs of libvirt. The RPC server deserialization code allocates memory for arrays before the non-negative length check is performed by the C API entry points. Passing a negative length to the g_new0 function results in a crash due to the negative length being treated as a huge positive number. This flaw allows a local, unprivileged user to perform a denial of service attack by causing the libvirt daemon to crash.
https://lists.libvirt.org/archives/list/[email protected]/thread/BKRQXPLPC6B7FLHJXSBQYW7HNDEBW6RJ/
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html