Authentication Flaw in Active Directory Integration on Linux Systems by Red Hat
CVE-2025-11561

8.8HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
9 October 2025

What is CVE-2025-11561?

A vulnerability has been identified in the integration of Active Directory with the System Security Services Daemon (SSSD) on Linux systems. By default, SSSD does not activate the Kerberos local authentication plugin (sssd_krb5_localauth_plugin). This allows attackers who can modify specific Active Directory attributes, such as userPrincipalName or samAccountName, to impersonate users with elevated privileges. This potential exploitation can lead to unauthorized access and privilege escalation on domain-connected Linux hosts, underscoring the need for immediate review and remediation.

References

https://access.redhat.com/security/cve/CVE-2025-11561
vdb-entryx_refsource_REDHAT
https://blog.async.sg/kerberos-ldr
https://bugzilla.redhat.com/show_bug.cgi?id=2402727
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Zavier Lee for reporting this issue.
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CVE-2025-11561 : Authentication Flaw in Active Directory Integration on Linux Systems by Red Hat