Description
A flaw was found in the integration of Active Directory and the System Security Services Daemon (SSSD) on Linux systems. In default configurations, the Kerberos local authentication plugin (sssd_krb5_localauth_plugin) is enabled, but a fallback to the an2ln plugin is possible. This fallback allows an attacker with permission to modify certain AD attributes (such as userPrincipalName or samAccountName) to impersonate privileged users, potentially resulting in unauthorized access or privilege escalation on domain-joined Linux hosts.
References10
- access.redhat.com/errata/RHSA-2025:19610
- access.redhat.com/errata/RHSA-2025:19847
- access.redhat.com/errata/RHSA-2025:19848
- access.redhat.com/errata/RHSA-2025:19849
- access.redhat.com/errata/RHSA-2025:19850
- access.redhat.com/errata/RHSA-2025:19851
- access.redhat.com/errata/RHSA-2025:19852
- access.redhat.com/errata/RHSA-2025:19853
- access.redhat.com/errata/RHSA-2025:19854
- access.redhat.com/errata/RHSA-2025:19859
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 58 · as of 9 November 2026
- CWE
- CWE-269
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.