This article provides information on whether vSRX 3.0 supports RHEL 9 prior to Junos 23.4R1.
The vSRX 3.0 does not support RHEL 9 prior to Junos 23.4R1. Support for RHEL 9 is available starting from Junos 23.4R1.
For more information, please refer to the following document: Requirements for vSRX Virtual Firewall on KVM