Medium
Canonical Ubuntu
USN-4017-1 fixed vulnerabilities in the Linux kernel for Ubuntu. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SO_SNDBUF values. This update fixes the problem.
We apologize for the inconvenience.
Jonathan Looney discovered that the Linux kernel could be coerced into segmenting responses into multiple TCP segments. A remote attacker could construct an ongoing sequence of requests to cause a denial of service.
CVEs contained in this USN include: CVE-2019-11479
Severity is medium unless otherwise noted.
Users of affected products are strongly encouraged to follow one of the mitigations below: