CVE-2022-49610 Information

Description

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 SPEC_CTRL write and the vmenter.

[ bp: Fix 32-bit build. ]

Reference

https://git.kernel.org/stable/c/07853adc29a058c5fd143c14e5ac528448a72ed9 https://git.kernel.org/stable/c/afd743f6dde87296c6f3414706964c491bb85862