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[Launchpad Bug Tracker <2023220@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 5.4.0-153.170

---------------
linux (5.4.0-153.170) focal; urgency=medium

  * focal/linux: 5.4.0-153.170 -proposed tracker (LP: #2024108)

  * cls_flower: off-by-one in fl_set_geneve_opt (LP: #2023577)
    - net/sched: flower: fix possible OOB write in fl_set_geneve_opt()

  * Some INVLPG implementations can leave Global translations unflushed when
    PCIDs are enabled (LP: #2023220)
    - x86/mm: Avoid incomplete Global INVLPG flushes

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Fri, 16 Jun
2023 10:20:20 -0300

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

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

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https://bugs.launchpad.net/bugs/2023220

Title:
  Some INVLPG implementations can leave Global translations unflushed
  when PCIDs are enabled

Status in linux package in Ubuntu:
  Fix Released
Status in linux-oem-6.1 package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Incomplete
Status in linux-oem-6.1 source package in Trusty:
  Invalid
Status in linux source package in Xenial:
  Incomplete
Status in linux-oem-6.1 source package in Xenial:
  Invalid
Status in linux source package in Bionic:
  Incomplete
Status in linux-oem-6.1 source package in Bionic:
  Invalid
Status in linux source package in Focal:
  Fix Released
Status in linux-oem-6.1 source package in Focal:
  Invalid
Status in linux source package in Jammy:
  Fix Released
Status in linux-oem-6.1 source package in Jammy:
  Fix Released
Status in linux source package in Kinetic:
  Fix Released
Status in linux-oem-6.1 source package in Kinetic:
  Invalid
Status in linux source package in Lunar:
  Fix Released
Status in linux-oem-6.1 source package in Lunar:
  Invalid
Status in linux source package in Mantic:
  Fix Released
Status in linux-oem-6.1 source package in Mantic:
  Invalid

Bug description:
  [Impact]
  When PCIDs are enabled on Alder Lake and Raptor Lake, INVLPG will not flush the global TLB entries. This can lead to info leak or undefined behavior.

  [Mitigation]
  Boot with nopcid on affected systems.

  [Test case]
  There is no particular test case.

  [Potential regressions]
  This affects performance on the affected systems. TLB behavior could also be affected.

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