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sssd

A vulnerability in SSSD allows a local user to cause a denial of service (DoS) by disrupting system authentication services. The flaw occurs in the handling of GSSAPI authentication in the PAM responder, where cached connection state is freed without clearing the reference pointer. This can lead to the service accessing invalid memory and terminating unexpectedly.

CVE-2026-104039 is a local denial of service vulnerability in SSSD related to the handling of Generic Security Services Application Programming Interface (GSSAPI) authentication within the Pluggable Authentication Module (PAM) responder. Specifically, after completion of a request, the cached connection state is freed but the reference pointer is not cleared. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and crash, disrupting system authentication services.

A vulnerability in SSSD allows a local user to cause a denial of service (DoS) by disrupting system authentication services. The flaw occurs in the handling of GSSAPI authentication in the PAM responder, where cached connection state is freed without clearing the reference pointer. This can lead to 

A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. (CVE-2026-104039)

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