CVE-2016-6828: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 1.2% chance of exploitation in the next 30 days.

The tcp_check_send_head function in include/net/tcp.h in the Linux kernel before 4.7.5 does not properly maintain certain SACK state after a failed data copy, which allows local users to cause a denial of service (tcp_xmit_retransmit_queue use-after-free and system crash) via a crafted SACK option.

Affected products

• Linux Linux Kernel: up to and including 4.7.4

Published 2016-10-16. Last modified 2026-06-17.