What does NTSTATUS 0xC000049F (STATUS_VRF_CFG_ENABLED) mean?

 
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STATUS_STORAGE_LOST_DATA_PERSISTENCE STATUS_PARTITION_TERMINATING

STATUS_VRF_CFG_ENABLED

The rejected operation is a volatile Driver Verifier reconfiguration

STATUS_VRF_CFG_ENABLED is narrowly about Driver Verifier volatile settings when CFG is enabled. Volatile Verifier settings are runtime changes intended for debugging; Microsoft documents that some verifier options can be activated or changed without rebooting, but not every configuration is valid in every protection state.

Control Flow Guard (CFG) is a platform security mitigation that restricts indirect call targets. The status should therefore not be treated as a generic Driver Verifier failure or as evidence that the target driver failed verification. It says the requested volatile-setting operation is incompatible with the current CFG-enabled context.

What to record

  • The exact verifier command, flags and target drivers used for the volatile change.
  • The Verifier settings active before the request and whether the change was attempted at runtime.
  • CFG state and the Windows build on the test machine.
  • Whether the same verification goal can be configured persistently for the next boot instead of through volatile settings.

Do not disable CFG as a routine workaround on a production system. Driver Verifier is a testing tool and can deliberately stress drivers; reproduce the intended verifier configuration in a controlled test environment and choose a supported configuration path.

References

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