[Bug 1759920] Re: intel-microcode 3.20180312.0 causes lockup at login screen

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.2.0-150.197

---------------
linux (3.2.0-150.197) precise; urgency=medium

  * precise/linux: 3.2.0-150.197 -proposed tracker (LP: #1919172)

  * CVE-2021-27365
    - scsi: iscsi: Verify lengths on passthrough PDUs
    - sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
    - scsi: iscsi: Ensure sysfs attributes are limited to PAGE_SIZE

  * CVE-2021-27363 // CVE-2021-27364
    - scsi: iscsi: Restrict sessions and handles to admin capabilities

  * CVE-2021-27364
    - scsi: iscsi: respond to netlink with unicast when appropriate
    - Add file_ns_capable() helper function for open-time capability checking
    - net: Add variants of capable for use on on sockets
    - netlink: Make the sending netlink socket availabe in NETLINK_CB

 -- Thadeu Lima de Souza Cascardo <cascardo at canonical.com>  Mon, 05 Apr
2021 14:23:29 -0300

** Changed in: linux (Ubuntu)
       Status: Invalid => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-27363

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-27364

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-27365

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https://bugs.launchpad.net/bugs/1759920

Title:
  intel-microcode 3.20180312.0 causes lockup at login screen

Status in intel-microcode package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Fix Released
Status in intel-microcode source package in Trusty:
  Invalid
Status in linux source package in Trusty:
  Fix Released
Status in intel-microcode source package in Xenial:
  Invalid
Status in linux source package in Xenial:
  Fix Released
Status in intel-microcode source package in Artful:
  Invalid
Status in linux source package in Artful:
  Fix Released

Bug description:
  [Impact]

   * Some systems experience kernel lockups after updating to the latest intel-microcode
     package or when receiving updated microcode from a BIOS update.

   * In many cases, the lockups occur before users can reach the login screen which makes
     it very difficult to debug/workaround.

  [Test Case]

   * The most reliable test case currently known is to install the sssd package. Lockups
     may occur during package installation (disable IBPB by writing 0 to
     /proc/sys/kernel/ibpb_enabled to prevent this from happening). A lockup will most
     likely occur just after booting the system up as the lock screen is displayed.

  [Regression Potential]

   * The fix is in the task switching code of the kernel so complexity of the change is
     relatively high.

  [Original Report]

  I don't know if this is a problem with the kernel or the microcode,
  but we have a significant number of computers in our organization (on
  both 16.04 and 17.10) that fail if they have both updated.  Booting
  with either linux-image-4.13.0-36-generic or intel-microcode
  3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to
  boot.

  ## Workaround ##
  1. Boot the system with the dis_ucode_ldr kernel boot parameter to temporary avoid the problem:
     https://wiki.ubuntu.com/Kernel/KernelBootParameters
  2. Install the previous version of package from
     https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/14261530/+files/intel-microcode_3.20180108.0+really20170707ubuntu16.04.1_amd64.deb
  3. (Optional) Hold the package so that it won't be upgraded accidentally
     sudo apt-mark hold intel-microcode

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