# CVE-2025-11561: Sssd: sssd default kerberos configuration allows privilege escalation on ad-joined linux systems

Status: published. Published: 2025-10-09. Updated: 2026-11-04.

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.

## Remediation

- workaround: To mitigate this issue, ensure the SSSD Kerberos local authentication plugin (sssd_krb5_localauth_plugin) is configured and the an2ln plugin is disabled by adding "disable = an2ln" in a krb5 include file, for example /var/lib/sss/pubconf/krb5.include.d/localauth_plugin and make sure it is included in the Kerberos configuration. Apply vendor updates and follow Red Hat guidance for SSSD hardening. (source: CNA: redhat)

## Affected products and versions

-  /  (sssd): ≥ 0; ≤ 2.11.1 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (sssd): ≥ 0:2.10.2-3.el10_0.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (sssd): ≥ 0:2.11.1-2.el10_1.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (sssd): ≥ 0:1.16.5-10.el7_9.17; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (sssd): ≥ 0:2.9.4-5.el8_10.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support (sssd): ≥ 0:2.2.3-20.el8_2.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (sssd): ≥ 0:2.4.0-9.el8_4.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (sssd): ≥ 0:2.4.0-9.el8_4.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (sssd): ≥ 0:2.6.2-4.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service (sssd): ≥ 0:2.6.2-4.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (sssd): ≥ 0:2.6.2-4.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (sssd): ≥ 0:2.8.2-4.el8_8.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (sssd): ≥ 0:2.8.2-4.el8_8.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (sssd): ≥ 0:2.9.7-4.el9_7.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (sssd): ≥ 0:2.6.2-4.el9_0.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (sssd): ≥ 0:2.8.2-5.el9_2.6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (sssd): ≥ 0:2.9.4-6.el9_4.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (sssd): ≥ 0:2.9.6-4.el9_6.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.12 (openshift/ose-rhel-coreos-8): ≥ 412.86.202601061735-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.13 (openshift/ose-rhel-coreos-9): ≥ 413.92.202601130113-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.14 (openshift/ose-rhel-coreos-9): ≥ 414.92.202511122212-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.15 (openshift/ose-rhel-coreos-9): ≥ 415.92.202512100122-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.16 (openshift/ose-rhel-coreos-9): ≥ 416.94.202512030118-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.17 (openshift/ose-rhel-coreos-9): ≥ 417.94.202511260612-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.18 (openshift/ose-rhel-coreos-9): ≥ 418.94.202511170715-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.19 (openshift/ose-rhel-coreos-9): ≥ 4.19.9.6.202511252219-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.20 (openshift/ose-rhel-coreos-9): ≥ 4.20.9.6.202511252309-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Ceph Storage 7 (rhceph/rhceph-7-rhel9): ≥ 7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Ceph Storage 8 (rhceph/rhceph-8-rhel9): ≥ 8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (sssd): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.82% as of 2026-11-04; percentile 57.45%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-269

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:19610 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19847 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19848 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19849 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19850 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19851 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19852 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19853 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19854 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19859 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:20954 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:21020 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:21067 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:21329 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:21795 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22256 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22265 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22277 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22529 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22548 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:22724 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:23113 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0316 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0677 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-11561 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://blog.async.sg/kerberos-ldr (CNA: redhat)

- https://bugzilla.redhat.com/show_bug.cgi?id=2402727 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/SSSD/sssd/issues/8021 (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2025:19610 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19847 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19848 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19849 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19850 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19851 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19852 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19853 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19854 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19859 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:20954 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:21020 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:21067 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:21329 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:21795 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22256 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22265 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22277 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22529 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22548 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:22724 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:23113 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:0316 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:0677 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-11561 (secalert@redhat.com)

- https://blog.async.sg/kerberos-ldr (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2402727 (secalert@redhat.com)

- https://github.com/SSSD/sssd/issues/8021 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-11561; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11561; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-11561; retrieved 2026-11-04; source updated Not reported

Revision: 159341b1984b21af98f908c59dfb0e9a5bd767d4bc35a493189cc4d668495607

Canonical: https://y2.dev/cve/CVE-2025-11561

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