Vulnerability in Red Hat Enterprise Linux 10

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.6

[ Description ]Official description

A flaw was found in FreeIPA. When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund23 Sep 2026WID-SEC-2026-3552

  Red Hat Enterprise Linux (FreeIPA): Multiple vulnerabilities Translated from German

  CVE-2026-11861CVE-2026-19550CVE-2026-79678+5 more CVEs

[ References ]References

• access.redhat.com/errata/RHSA-2026:70564vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:72279vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:82935vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:83083vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:83084vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:83085vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:83460vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:83461vendor-advisoryx_refsource_REDHAT
• access.redhat.com/security/cve/CVE-2026-11861vdb-entryx_refsource_REDHAT
• bugzilla.redhat.com/show_bug.cgiissue-trackingx_refsource_REDHAT