cve/2019/CVE-2019-11478.md

### [CVE-2019-11478](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478)
![](https://img.shields.io/static/v1?label=Product&message=Linux%20kernel&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=4.4%3C%204.4.182%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-770%20Allocation%20of%20Resources%20Without%20Limits%20or%20Throttling&color=brighgreen)

### Description

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit f070ef2ac66716357066b683fb0baf55f8191a2e.

### POC

#### Reference
- http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html
- http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html
- http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html

#### Github
- https://github.com/DevOps-spb-org/Linux-docs
- https://github.com/Ivan-778/docLinux
- https://github.com/hightemp/docLinux
- https://github.com/kaosagnt/ansible-everyday
- https://github.com/misanthropos/FFFFM