CVE-2019-11479
7.5 · HIGHOverview
CVE-2019-11479 is a high-severity vulnerability affecting linux linux_kernel. It was published on June 19, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. 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 commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
Remediation
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linux | linux_kernel | >= 4.4, < 4.4.182 | Affected |
| f5 | big-ip_advanced_firewall_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_access_policy_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_application_acceleration_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_link_controller | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_policy_enforcement_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_webaccelerator | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_application_security_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_local_traffic_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_fraud_protection_service | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_global_traffic_manager | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_analytics | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_edge_gateway | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-ip_domain_name_system | >= 11.5.2, < 11.6.5.1 | Affected |
| f5 | big-iq_centralized_management | 5.1.0 | Affected |
| f5 | traffix_signaling_delivery_controller | 5.0.0 | Affected |
References
Frequently Asked Questions
What is CVE-2019-11479?
CVE-2019-11479 is a high-severity vulnerability affecting linux linux_kernel. It was published on June 19, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2019-11479?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2019-11479?
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2019-11479?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-11479 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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