CVE-2020-36694: Linux Kernel

Medium severity, CVSS 6.7. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: before 5.10 (fixed in 5.10)

Published 2023-05-21. Last modified 2026-06-17.