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CVE-2019-11478

5.3 · MEDIUM

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.

Published Jun 19, 2019CWE-770EPSS 94.69%

Overview

CVE-2019-11478 is a medium-severity vulnerability. It was published on June 19, 2019 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. 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 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.

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/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.htmlRefpacketstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlRefwww.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtRefwww.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/2019/10/29/3Refwww.vmware.com/security/advisories/VMSA-2019-0010.html

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11478?

CVE-2019-11478 is a medium-severity vulnerability. It was published on June 19, 2019 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2019-11478?

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-11478?

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-2019-11478?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11478 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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