CVE-2026-104044: sssd denial of service via passkey Kerberos authentication

CVE-2026-104044 · Severity: medium · CVSS 6.2 · Published 2026-10-06

sssd is a critical system service that manages user authentication on Linux systems. A local attacker can crash the authentication service by sending a specially crafted request when passkey authentication is enabled, preventing legitimate users from logging in. The vulnerability requires local system access and only affects systems with passkey authentication configured.

Technologies: Sssd.

Quick answers

Is CVE-2026-104044 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-104044 being exploited in the wild.
How severe is CVE-2026-104044?
Medium severity, with a CVSS score of 6.2, published 6 October 2026.
Which products and versions are affected?
sssd.
Is there a fix for CVE-2026-104044?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-104044 attacked?
It is attacked with local access.
Am I affected by CVE-2026-104044?
Check whether you run Sssd. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A NULL pointer dereference flaw exists in sssd's passkey Kerberos handling due to missing state validation in the PAM responder. A local attacker can trigger a crash by sending a crafted PAM request when passkey authentication is enabled. The attack requires local socket access to the PAM responder and results in service unavailability with no code execution risk.

Affected products

  • sssd

Timeline

  • 2026-10-06: disclosed

References

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