CVE-2026-127101 Sssd: sssd: null pointer dereference in pam responder when protocol version negotiation is skipped

A flaw was found in SSSD's PAM responder. A local attacker can send an authentication request without first negotiating the client protocol version. The responder dereferences a NULL protocol-version pointer and crashes, disrupting SSSD-backed authentication. Repeated crafted requests can sustain...