CVE-2026-104042

A flaw was found in sssd. A local attacker can cause a Denial of Service (DoS) by sending a crafted Pluggable Authentication Module (PAM) request containing a zero-length authentication token to the responder socket. Due to missing input validation, the service attempts to read beyond buffer boundaries when processing the token, causing the PAM responder to crash.

This vulnerability is rated as having Moderate impact because it requires local host access and is confined to causing a denial of service against the SSSD PAM responder service. Successful exploitation does not facilitate remote access, privilege escalation, or unauthorized data exposure. While local unprivileged users can interact with the PAM responder socket in standard deployments, the impact remains restricted to service disruption until the responder process is restarted.

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.