A flaw was found in the X.Org server. The GLX PBuffer code does not call the XACE hook when creating the buffer, leaving it unlabeled. When the client issues another request to access that resource (as with a GetGeometry) or when it creates another resource that needs to access that buffer, such as a GC, the XSELINUX code will try to use an object that was never labeled and crash because the SID is NULL.
access.redhat.com/errata/RHSA-2024:0320
access.redhat.com/security/cve/CVE-2024-0408
bugzilla.redhat.com/show_bug.cgi?id=2257689
lists.debian.org/debian-lts-announce/2024/01/msg00016.html
lists.fedoraproject.org/archives/list/[email protected]/message/5J4H7CH565ALSZZYKOJFYDA5KFLG6NUK/
lists.fedoraproject.org/archives/list/[email protected]/message/EJBMCWQ54R6ZL3MYU2D2JBW6JMZL7BQW/
lists.fedoraproject.org/archives/list/[email protected]/message/IZ75X54CN4IFYMIV7OK3JVZ57FHQIGIC/
security.gentoo.org/glsa/202401-30
security.netapp.com/advisory/ntap-20240307-0006/