CVE-2026-104044

A flaw was found in sssd. A local attacker can trigger a Denial of Service (DoS) by sending a specially crafted Pluggable Authentication Module (PAM) request when passkey authentication is enabled. Due to a missing state validation check in passkey Kerberos handling, the PAM responder dereferences an uninitialized pointer and crashes. This failure disrupts authentication services on the host.

This vulnerability is rated as Moderate severity because it requires local system access to communicate with the PAM responder socket and results exclusively in a service crash, with no risk of remote code execution or unauthorized data exposure. The issue is further constrained because exploitation is only possible when passkey authentication is actively enabled on the host. Under standard configurations where passkey support is not configured, or where local socket interactions are restricted, standard authentication handling across the system remains unaffected.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.