A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
https://www.openwall.com/lists/oss-security/2021/02/10/4
https://www.debian.org/security/2021/dsa-4852
https://security.gentoo.org/glsa/202311-16
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html