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CVE-2019-11477

HighPublished

Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs

Published: Jun 18, 2019
Updated: Sep 17, 2024
Assigning CNA: canonical
Evidence observed: Aug 4, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

98.7%

High · next 30 days

Percentile: 99.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

cve-2019-11477-pocPoC
Proof-of-concept exploit for CVE-2019-11477, demonstrating a denial-of-service attack against Linux kernel TCP SACK panic via crafted netfilter packets and kernel module interception.

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