CVE-2026-104035

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On systems that do not require KCM credential caching, disable the KCM responder by stopping and masking the sssd-kcm socket and service:\n\n# systemctl stop sssd-kcm.socket sssd-kcm.service\n# systemctl mask sssd-kcm.socket sssd-kcm.service\n\nBefore disabling KCM, ensure an alternative Kerberos credential cache type (for example FILE: or KEYRING:) is configured in /etc/krb5.conf, because clients or system configurations that default to KCM: credential caches would otherwise lose Kerberos ticket management. On systems where KCM is required, restrict access to the KCM UNIX socket (/var/run/.heim_org.h5l.kcm-socket) to trusted local users where deployment policy permits. 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