Bug 2347926 (CVE-2022-49610)

Summary: CVE-2022-49610 kernel: KVM: VMX: Prevent RSB underflow before vmenter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:11:34 UTC 
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. ]
Comment 1 Avinash Hanwate 2025-02-26 10:54:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022613-CVE-2022-49610-5628@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 15:21:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022613-CVE-2022-49610-5628@gregkh/T