TCP performance issues and stalls when using kernel-3.10.0-957.21.3.el7 or any kernel with TCP SACK PANIC CVE fixes

Solution Verified - Updated -

Issue

  • After updating to a kernel which includes the fix for TCP SACK Panic CVE-2019-11478, TCP connections stall or time out.

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Virtualization 4
  • Red Hat Enterprise MRG 2
  • OpenShift Container Platform 4.1
  • CVE-2019-11477, CVE-2019-11478 & CVE-2019-11479

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