After an upgrade to #kernel 6.5.8 I found the following line in the boot log:

MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details.

Here's a quick HowTo prevent this:

su
vi /etc/default/grub

...
GRUB_CMDLINE_LINUX_DEFAULT=... mds=full,nosmt
...

:wq

ubdate-grub
exit

Reboot.

#linux #debian #grub #cpu #mds