<s>
TLBleed	B-Device
is	O
a	O
cryptographic	O
side-channel	O
attack	O
that	O
uses	O
machine	O
learning	O
to	O
exploit	O
a	O
timing	O
side-channel	O
via	O
the	O
translation	B-Architecture
look-aside	I-Architecture
buffer	I-Architecture
(	O
TLB	O
)	O
on	O
modern	O
microprocessors	O
that	O
use	O
simultaneous	B-Operating_System
multithreading	I-Operating_System
.	O
</s>
<s>
The	O
attack	O
led	O
to	O
the	O
OpenBSD	B-Operating_System
project	I-Operating_System
disabling	O
simultaneous	B-Operating_System
multithreading	I-Operating_System
on	O
Intel	O
microprocessors	O
.	O
</s>
<s>
The	O
OpenBSD	B-Operating_System
project	I-Operating_System
leader	O
Theo	O
de	O
Raadt	O
has	O
stated	O
that	O
,	O
while	O
the	O
attack	O
could	O
theoretically	O
be	O
addressed	O
by	O
preventing	O
tasks	O
with	O
different	O
security	O
contexts	O
from	O
sharing	O
physical	O
cores	O
,	O
such	O
a	O
fix	O
is	O
currently	O
impractical	O
because	O
of	O
the	O
complexity	O
of	O
the	O
problem	O
.	O
</s>
