CVE-2012-4565: Linux Kernel

Medium severity, CVSS 4.7. EPSS: 0.5% chance of exploitation in the next 30 days.

The tcp_illinois_info function in net/ipv4/tcp_illinois.c in the Linux kernel before 3.4.19, when the net.ipv4.tcp_congestion_control illinois setting is enabled, allows local users to cause a denial of service (divide-by-zero error and OOPS) by reading TCP stats.

Affected products

• Linux Linux Kernel: up to and including 3.4.18; version 3.4.1 only; version 3.4.2 only; version 3.4.3 only; version 3.4.4 only; version 3.4.5 only; …

Published 2012-12-21. Last modified 2026-06-16.