CVE-2019-11478

CVE-2019-11478 describes a denial-of-service vulnerability in the Linux kernel's TCP retransmission queue, specifically affecting the tcp_fragment implementation when handling certain TCP Selective Acknowledgment (SACK) sequences. This flaw impacts various products including Canonical, F5, Ivanti, Linux, PulseSecure, and Red Hat. With a CVSS score of 7.5 (High), this vulnerability is remotely exploitable with low attack complexity, allowing an unauthenticated attacker to cause a denial of service. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating awareness and potential for future exploitation.