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Change History

In the Linux kernel, the following vulnerability has been resolved:

KVM: VMX: Prevent RSB underflow before vmenter

On VMX, there are some balanced returns between the time the guest's
SPEC_CTRL value is written, and the vmenter.

Balanced returns (matched by a preceding call) are usually ok, but it's
at least theoretically possible an NMI with a deep call stack could
empty the RSB before one of the returns.

For maximum paranoia, don't allow *any* returns (balanced or otherwise)
between the SP

https://git.kernel.org/stable/c/07853adc29a058c5fd143c14e5ac528448a72ed9

https://git.kernel.org/stable/c/afd743f6dde87296c6f3414706964c491bb85862