The Intel Shadow Stack support that is part of their Control-flow Enforcement Technology (CET) has finally been merged for the Linux 6.6 kernel after it was previously rejected by Linus Torvalds.
Intel engineers had sent in Shadow Stack support for Linux 6.4 as this feature part of Control-flow Enforcement Technology (CET) but it hit a last-minute snag during the merge window with issues raised by Linus Torvalds
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Since Linux 5.18 there has been Indirect Branch Tracking (IBT) in the mainline kernel that was contributed by Intel as part of their Control-flow Enforcement Technology (CET)