A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit.

AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CWE-825

https://access.redhat.com/security/cve/CVE-2026-12610

https://bugzilla.redhat.com/show_bug.cgi?id=2490288

https://github.com/SSSD/sssd/issues/8796

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