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CVE-2019-11477

7.5 · HIGH

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).

Published Jun 19, 2019CWE-190EPSS 98.75%

Overview

CVE-2019-11477 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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.

References

Refpacketstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.htmlRefpacketstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlRefwww.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtRefwww.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-enRefwww.openwall.com/lists/oss-security/2019/06/20/3Refwww.openwall.com/lists/oss-security/2019/06/28/2Refwww.openwall.com/lists/oss-security/2019/07/06/3Refwww.openwall.com/lists/oss-security/2019/07/06/4Refwww.openwall.com/lists/oss-security/2019/10/24/1Refwww.openwall.com/lists/oss-security/2019/10/29/3

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11477?

CVE-2019-11477 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11477 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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