CVE-2020-36694 (linux_kernel)

An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.

context cpu cve exploited free iptables issue kernel linux linux kernel namespace netfilter packet rules use-after-free