CVE-2019-11477 Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs

What is CVE-2019-11477?

CVE-2019-11477 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 18 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-190

Which versions are affected by CVE-2019-11477?

It affects 24 products.

Products include Canonical Ubuntu Linux, F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager and 18 more.

How do I fix CVE-2019-11477?

Apply the vendor's patch.

Is CVE-2019-11477 being exploited?

There is no known exploitation of CVE-2019-11477 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-11477, GHSA-748j-px2m-cwgh, UBUNTU-CVE-2019-11477.