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I noticed an error in GCP log:

[    0.294304] MMIO Stale Data: Vulnerable: Clear CPU buffers attempted, no microcode

After installation, I then ran these commands:

sudo apt-get install microcode.ctl intel-microcode
sudo reboot now

However, running sudo dmesg | grep microcode still states that there is no microcode (see image below).

enter image description here

System specs:

System: Ubuntu 20.04.5 LTS (GNU/Linux 5.15.0-1025-gcp x86_64)
CPU: Intel(R) Xeon(R) CPU @ 2.20GHz

Artur Meinild
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TurnItOffAndOnAgain
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1 Answers1

1

That's not an error message, but a status message related to the "Processor MMIO Stale Data Vulnerabilities".

From Kernel.org documentation:

Mitigation status information

The Linux kernel provides a sysfs interface to enumerate the current vulnerability status of the system: whether the system is vulnerable, and which mitigations are active. The relevant sysfs file is:

/sys/devices/system/cpu/vulnerabilities/mmio_stale_data

The possible values in this file are:

Value Status
‘Not affected’ The processor is not vulnerable
‘Vulnerable’ The processor is vulnerable, but no mitigation enabled
‘Vulnerable: Clear CPU buffers attempted, no microcode’ The processor is vulnerable, but microcode is not updated. The mitigation is enabled on a best effort basis.
‘Mitigation: Clear CPU buffers’ The processor is vulnerable and the CPU buffer clearing mitigation is enabled.
‘Unknown: No mitigations’ The processor vulnerability status is unknown because it is out of Servicing period. Mitigation is not attempted.

So this is basically a service message that tells you that your CPU has this vulnerability, and that there isn't a microcode fix for it installed.

It seems you have the latest microcode packages installed - so I suppose a full fix isn't possible for that CPU at this time.

Artur Meinild
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