GHSA-MC29-HMX6-856Q Ella Core has handover failures during concurrent Security Mode Command

Summary Ella Core didn't enforce security rules on concurrent running of security procedures defined in TS 33.501 §6.9.5.1 — it could send a NAS Security Mode Command while an N2 handover was still pending and vice versa. Impact Concurrent Security Mode Command and N2 handover produce a KgNB...