pcichangeirqlevel in hw/pci/pci.c in QEMU before 5.1.1 has a NULL pointer dereference because pciget_bus() might not return a valid pointer.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-25742.json"
[ { "events": [ { "introduced": "0" }, { "fixed": "5.1.1" } ] }, { "events": [ { "introduced": "0" }, { "fixed": "5.1.1" } ] } ]