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 <casca...@canonical.com> 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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2023220/+subscriptions
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