Release Notes: Milestone 73

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Current Status

Image Family cos-73-lts
Deprecated After Jun 19, 2020
Kernel 4.14.174
Kubernetes v1.13.3
Docker v18.09.7



Date: Sep 05, 2020
  • Fixed Linux kernel vulnerability CVE-2020-14386 by fixing an integer overflow issue in tpacket_rcv.


Date: July 13, 2020
  • Moved Kernel source to
  • Mounted /var/lib/containerd with exec option.
  • Fixed incorrect bprm->vma_pages prevent capturing all stack pages.


Date: May 07, 2020
  • Image rebuild to address an infrastructure issue. No image changes.


Date: Apr 13, 2020
  • Disabled `accept_ra` on all interfaces by default.
  • Upgraded OpenSSH to 7.9_p1 to fix CVE-2018-15473.


Date: Apr 05, 2020
  • Upgraded the Linux kernel to v4.14.174.
  • Backported systemd patch ba0d56f55 to address an issue that resulted in leaked mount units.


Date: Feb 21, 2020
  • Fixed TCP empty skb at the tail of the write queue bug in kernel.
  • Upgraded the Linux kernel to v4.14.171.


Date: Feb 12, 2020
  • Upgraded runc to 1.0.0-rc10. This resolves CVE-2019-19921.
  • Upgraded the Linux kernel to v4.14.170.


Date: Jan 07, 2020
  • Fixed CFS quota throttling issue.
  • Increase sysctl net.ipv4.tcp_limit_output_bytes to 1048576.
  • Upgraded the Linux kernel to v4.14.160.


Date: Oct 28, 2019
  • Upgraded the Linux kernel to v4.14.150.
  • Fixed the unnecessary creation of two separate test slices (resulting in 4 systemd log messages total + runtime overhead) for every runc execution.
  • Fixed a performance regression in completely fair scheduler (CFS).


Date: Oct 21, 2019
  • Fixed an issue in systemd that resulted in unnecessary CPU consumption.
  • Fixed an issue in runc that resulted in unnecessary CPU consumption.


Date: Oct 08, 2019
  • Upgraded the Linux kernel to 4.14.145.
  • Backported a kernel patch to ensure the cfs cgroup quota/period ratio always stays the same. This addresses a Kubernetes issue where the pod cgroup could be changed into an inconsistent state.


Date: Sep 04, 2019
  • Upgraded containerd to v1.2.8.
  • Upgraded the Linux kernel to version 4.14.138.
  • Backported upstream writeback patches to fix a softlockup issue.


Date: Aug 08, 2019
    Upgraded the Linux kernel to v4.14.137. This resolves CVE-2019-1125.


Date: Jul 12, 2019
  • Upgraded Docker to version 18.09.7. This resolves CVE-2018-15664.
  • Upgraded runc to version 1.0.0_rc8.
  • Upgraded docker-proxy to version 0.8.0_p20190513.


Date: Jul 02, 2019
  • Upgraded containerd to v1.2.7.
  • Updated kernel to version v4.14.131.
  • Fixed vulnerability in app-arch/bzip2 (CVE-2019-12900).
  • Fixed an issue introduced by NFLX-2019-001 fixes.


Date: Jun 19, 2019
  • Updated the Linux kernel to version 4.14.127 to resolve the NFLX-2019-001 TCP SACK vulnerabilities.


Date: Jun 17, 2019
  • Updated kernel to version v4.14.124.
  • Backported affinity change-set for napi-tx.


Date: May 28, 2019
  • Upgraded curl to v7.64.1 to fix CVE-2018-16890.
  • Upgraded containerd to version 1.2.6.
  • Set OOM score to -999 for docker.service and containerd.service to enhance the reliability of core system daemons.
  • Add restart policy in containerd.service, and corrected docker.service's dependency on containerd.service to allow containerd to recover from crashes.
  • Backported affinity changes to support napi-tx in COS.
  • Cherry-picked upstream patch in kernel to fix a bug in lockd introduced by commit 01b79d20008d "lockd: Show pid of lockd for remote locks" in Linux kernel v4.14.105.
  • Rotated keys used by UEFI Secure Boot for signing and verifying the UEFI boot path.


Date: May 16, 2019
  • Merged Linux Stable Kernel 'v4.14.119' for resolving Microarchitectural Data Sampling (MDS) vulnerabilities (CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091).
  • Mitigated a mount hang issue in the Linux kernel.


Date: Apr 19, 2019
  • Set LimitNOFILE to 1048576 in containerd.service to fix an issue where the file descriptor limit was not being properly applied to containerd.


Date: Apr 01, 2019
  • Included perf tool in the image.
  • Fixed a bug that dockerd may start containerd even if containerd.service exists.
  • Fixed an issue where Docker did not preserve the UIDs/GIDs of the init process on exec.

cos-73-11647-112-0 (vs Milestone 69)

Date: Mar 25, 2019

New features

  • Added support for collecting kernel memory crash dumps.
  • Added support for RAID and LVM.
  • Added support for IPv6.
  • Added support for iscsi and multipath in the kernel.
  • Added support for kernel module signing.
  • Enabled auto updates on Shielded VMs that have never booted in secure boot mode. Auto update is still disabled on Shielded VMs that have previously booted in secure boot mode.
  • Disabled the CONFIG_DEVMEM configuration option in the kernel to restrict privileged access to system memory.
  • Added behavior for logging more debugging information to the serial console during boot.

Bug fixes

  • Fixed an issue observed in Kubernetes liveness probes.
  • Configured docker.service to always restart Docker after 10 seconds.
  • Fixed an issue where a race condition between Docker and containerd resulted in a Docker live restore failure.
  • Increased fs.inotify.max_user_instances to 1024.
  • Configured containerd to run as a standalone systemd service.

Package updates

  • Upgraded the built-in kubelet to v1.13.3.
  • Upgraded containerd to v1.2.5.
  • Upgraded openssl to 1.0.2q.
  • Upgraded Docker to 18.09.3.
  • Installed the pigz package for faster Docker image downloads.
  • Installed the keyutils package.
  • Installed the sosreport package.