CVE-2019-11477

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

98.7% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-04-23 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2019-06-19 00:15 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2019-06-19 19:15 UTC Fix referencedNVD first recorded a patch, advisory or mitigation link
4. 2026-06-17 02:12 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 98.7% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-06-19 00:15 UTC

Last modified

2026-06-17 02:12 UTC

Exploit probability

98.7% · EPSS, next 30 days

Weakness

CWE-190 · Integer overflow

Record status

Modified

Affected

• Linux Kernel < 3.16.69
• Linux Kernel < 4.4.182
• Linux Kernel < 4.9.182
• Linux Kernel < 4.14.127
• Linux Kernel < 4.19.52
• Linux Kernel < 5.1.11
• f5 big-ip Advanced Firewall Manager ≤ 11.6.4
• f5 big-ip Advanced Firewall Manager ≤ 12.1.4

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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