CVE-2019-11477
7.5 · HIGHOverview
CVE-2019-11477 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 TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). 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 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.
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 | >= 2.6.29, < 3.16.69 | Affected |
| f5 | big-ip_advanced_firewall_manager | 11.5.2 | Affected |
| f5 | big-ip_access_policy_manager | 11.5.2 | Affected |
| f5 | big-ip_application_acceleration_manager | 11.5.2 | Affected |
| f5 | big-ip_link_controller | 11.5.2 | Affected |
| f5 | big-ip_policy_enforcement_manager | 11.5.2 | Affected |
| f5 | big-ip_webaccelerator | 11.5.2 | Affected |
| f5 | big-ip_application_security_manager | 11.5.2 | Affected |
| f5 | big-ip_local_traffic_manager | 11.5.2 | Affected |
| f5 | big-ip_fraud_protection_service | 11.5.2 | Affected |
| f5 | big-ip_global_traffic_manager | 11.5.2 | Affected |
| f5 | big-ip_analytics | 11.5.2 | Affected |
| f5 | big-ip_edge_gateway | 11.5.2 | Affected |
| f5 | big-ip_domain_name_system | 11.5.2 | Affected |
References
Frequently Asked Questions
What is CVE-2019-11477?
CVE-2019-11477 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-2019-11477?
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-2019-11477?
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-2019-11477?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-11477 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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