Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. 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 commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
Image SLES15-SP1-Manager-4-0-Azure-BYOS-Proxy Image SLES15-SP1-Manager-4-0-Azure-BYOS-Server Image SLES15-SP1-Manager-4-0-EC2-HVM-BYOS-Proxy Image SLES15-SP1-Manager-4-0-EC2-HVM-BYOS-Server Image SLES15-SP1-Manager-4-0-GCE-BYOS-Proxy Image SLES15-SP1-Manager-4-0-GCE-BYOS-Server openSUSE Leap 15.0 openSUSE Leap 15.1 openSUSE Leap 15.3 openSUSE Leap 15.4 openSUSE Leap 42.3 openSUSE Tumbleweed SUSE Linux Enterprise Build System Kit 12 SP3 SUSE Linux Enterprise Build System Kit 12 SP4 SUSE Linux Enterprise Desktop 12 SP3 SUSE Linux Enterprise Desktop 12 SP4 SUSE Linux Enterprise Desktop 12 SP5 SUSE Linux Enterprise Desktop 15 SUSE Linux Enterprise Desktop 15 SP1 SUSE Linux Enterprise Desktop 15 SP2 SUSE Linux Enterprise Desktop 15 SP3 SUSE Linux Enterprise Desktop 15 SP4 SUSE Linux Enterprise Desktop 15 SP5 SUSE Linux Enterprise High Availability 12 SP2 SUSE Linux Enterprise High Availability 12 SP3 SUSE Linux Enterprise High Availability 12 SP4 SUSE Linux Enterprise High Availability 12 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