2303
Predictor state may also be shared between hardware threads, for example, sibling hardware
threads on a processor that supports simultaneous multithreading (SMT). This sharing may be
benign if the hardware threads are simultaneously executing in the same software component,
or it could expose a weakness if one sibling is a malicious software component, and the other
sibling is a victim software component. Processors that share microarchitectural predictors between
hardware threads may have features which prevent microarchitectural predictions that occur on
one hardware thread from influencing predictions that occur on another hardware thread.
Features that restrict predictor state sharing across transitions or between hardware threads may
be always-on, on by default, or may require opt-in from software.
Relationships
The table(s) below shows the weaknesses and high level categories that are related to this
weakness. These relationships are defined as ChildOf, ParentOf, MemberOr and give insight to
similar items that may exist at higher and lower levels of abstraction. In addition, relationships such
as PeerOf and CanAlsoBe are defined to show similar weaknesses that may want to be explored.
Relevant to the view "Research Concepts" (CWE-1000)
Nature Type ID Name Page
ChildOf 1420 Exposure of Sensitive Information during Transient
Execution