When I connect to the database and run a command on some catalogs, I get Msg 9100, Level 23

1> SELECT * FROM sys.databases; 2> GO Msg 9100, Level 23, State 2, Server x230, Line 1 Possible index corruption detected. Run DBCC CHECKDB. 

In the logs, I get

spid51      Error: 9100, Severity: 23, State: 2. spid51      Possible index corruption detected. Run DBCC CHECKDB. 

However, when I run DBCC CHECKDB, this shows up in the logs,

spid51      DBCC CHECKDB (mssqlsystemresource) executed by sa found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 0 seconds.  

I was connected with Single User Mode over DAC.

Full DBCC CHECKDB

Here is the full result of the DBCC CHECKDB command,

DBCC results for 'mssqlsystemresource'. Service Broker Msg 9675, State 1: Message Types analyzed: 14. Service Broker Msg 9676, State 1: Service Contracts analyzed: 6. Service Broker Msg 9667, State 1: Services analyzed: 3. Service Broker Msg 9668, State 1: Service Queues analyzed: 3. Service Broker Msg 9669, State 1: Conversation Endpoints analyzed: 0. Service Broker Msg 9674, State 1: Conversation Groups analyzed: 0. Service Broker Msg 9670, State 1: Remote Service Bindings analyzed: 0. Service Broker Msg 9605, State 1: Conversation Priorities analyzed: 0. DBCC results for 'sys.sysrscols'. There are 1700 rows in 20 pages for object "sys.sysrscols". DBCC results for 'sys.sysrowsets'. There are 223 rows in 3 pages for object "sys.sysrowsets". DBCC results for 'sys.sysclones'. There are 0 rows in 0 pages for object "sys.sysclones". DBCC results for 'sys.sysallocunits'. There are 271 rows in 3 pages for object "sys.sysallocunits". DBCC results for 'sys.sysfiles1'. There are 2 rows in 1 pages for object "sys.sysfiles1". DBCC results for 'sys.sysseobjvalues'. There are 0 rows in 0 pages for object "sys.sysseobjvalues". DBCC results for 'sys.syspriorities'. There are 0 rows in 0 pages for object "sys.syspriorities". DBCC results for 'sys.sysdbfrag'. There are 0 rows in 0 pages for object "sys.sysdbfrag". DBCC results for 'sys.sysfgfrag'. There are 0 rows in 0 pages for object "sys.sysfgfrag". DBCC results for 'sys.sysdbfiles'. There are 2 rows in 1 pages for object "sys.sysdbfiles". DBCC results for 'sys.syspru'. There are 0 rows in 0 pages for object "sys.syspru". DBCC results for 'sys.sysbrickfiles'. There are 0 rows in 0 pages for object "sys.sysbrickfiles". DBCC results for 'sys.sysphfg'. There are 1 rows in 1 pages for object "sys.sysphfg". DBCC results for 'sys.sysprufiles'. There are 2 rows in 1 pages for object "sys.sysprufiles". DBCC results for 'sys.sysftinds'. There are 0 rows in 0 pages for object "sys.sysftinds". DBCC results for 'sys.sysowners'. There are 14 rows in 1 pages for object "sys.sysowners". DBCC results for 'sys.sysdbreg'. There are 0 rows in 0 pages for object "sys.sysdbreg". DBCC results for 'sys.sysprivs'. There are 123 rows in 1 pages for object "sys.sysprivs". DBCC results for 'sys.sysschobjs'. There are 3665 rows in 71 pages for object "sys.sysschobjs". DBCC results for 'sys.syscsrowgroups'. There are 0 rows in 0 pages for object "sys.syscsrowgroups". DBCC results for 'sys.sysextsources'. There are 0 rows in 0 pages for object "sys.sysextsources". DBCC results for 'sys.sysexttables'. There are 0 rows in 0 pages for object "sys.sysexttables". DBCC results for 'sys.sysextfileformats'. There are 0 rows in 0 pages for object "sys.sysextfileformats". DBCC results for 'sys.sysmultiobjvalues'. There are 0 rows in 0 pages for object "sys.sysmultiobjvalues". DBCC results for 'sys.syscolpars'. There are 24408 rows in 464 pages for object "sys.syscolpars". DBCC results for 'sys.sysxlgns'. There are 0 rows in 0 pages for object "sys.sysxlgns". DBCC results for 'sys.sysxsrvs'. There are 0 rows in 0 pages for object "sys.sysxsrvs". DBCC results for 'sys.sysnsobjs'. There are 3 rows in 1 pages for object "sys.sysnsobjs". DBCC results for 'sys.sysusermsgs'. There are 0 rows in 0 pages for object "sys.sysusermsgs". DBCC results for 'sys.syscerts'. There are 5 rows in 3 pages for object "sys.syscerts". DBCC results for 'sys.sysrmtlgns'. There are 0 rows in 0 pages for object "sys.sysrmtlgns". DBCC results for 'sys.syslnklgns'. There are 0 rows in 0 pages for object "sys.syslnklgns". DBCC results for 'sys.sysxprops'. There are 0 rows in 0 pages for object "sys.sysxprops". DBCC results for 'sys.sysscalartypes'. There are 34 rows in 1 pages for object "sys.sysscalartypes". DBCC results for 'sys.systypedsubobjs'. There are 0 rows in 0 pages for object "sys.systypedsubobjs". DBCC results for 'sys.sysidxstats'. There are 1033 rows in 18 pages for object "sys.sysidxstats". DBCC results for 'sys.sysiscols'. There are 1160 rows in 8 pages for object "sys.sysiscols". DBCC results for 'sys.sysendpts'. There are 0 rows in 0 pages for object "sys.sysendpts". DBCC results for 'sys.syswebmethods'. There are 0 rows in 0 pages for object "sys.syswebmethods". DBCC results for 'sys.sysbinobjs'. There are 23 rows in 1 pages for object "sys.sysbinobjs". DBCC results for 'sys.sysaudacts'. There are 0 rows in 0 pages for object "sys.sysaudacts". DBCC results for 'sys.sysobjvalues'. There are 4547 rows in 1267 pages for object "sys.sysobjvalues". DBCC results for 'sys.syscscolsegments'. There are 0 rows in 0 pages for object "sys.syscscolsegments". DBCC results for 'sys.syscsdictionaries'. There are 0 rows in 0 pages for object "sys.syscsdictionaries". DBCC results for 'sys.sysclsobjs'. There are 21 rows in 1 pages for object "sys.sysclsobjs". DBCC results for 'sys.sysrowsetrefs'. There are 0 rows in 0 pages for object "sys.sysrowsetrefs". DBCC results for 'sys.sysremsvcbinds'. There are 0 rows in 0 pages for object "sys.sysremsvcbinds". DBCC results for 'sys.sysxmitqueue'. There are 0 rows in 0 pages for object "sys.sysxmitqueue". DBCC results for 'sys.sysrts'. There are 1 rows in 1 pages for object "sys.sysrts". DBCC results for 'sys.sysconvgroup'. There are 0 rows in 0 pages for object "sys.sysconvgroup". DBCC results for 'sys.sysdesend'. There are 0 rows in 0 pages for object "sys.sysdesend". DBCC results for 'sys.sysdercv'. There are 0 rows in 0 pages for object "sys.sysdercv". DBCC results for 'sys.syssingleobjrefs'. There are 6686 rows in 28 pages for object "sys.syssingleobjrefs". DBCC results for 'sys.sysmultiobjrefs'. There are 1117 rows in 6 pages for object "sys.sysmultiobjrefs". DBCC results for 'sys.sysguidrefs'. There are 4 rows in 1 pages for object "sys.sysguidrefs". DBCC results for 'sys.sysfoqueues'. There are 0 rows in 0 pages for object "sys.sysfoqueues". DBCC results for 'sys.syschildinsts'. There are 0 rows in 0 pages for object "sys.syschildinsts". DBCC results for 'sys.syscompfragments'. There are 0 rows in 0 pages for object "sys.syscompfragments". DBCC results for 'sys.sysftsemanticsdb'. There are 0 rows in 0 pages for object "sys.sysftsemanticsdb". DBCC results for 'sys.sysftstops'. There are 15829 rows in 121 pages for object "sys.sysftstops". DBCC results for 'sys.sysftproperties'. There are 0 rows in 0 pages for object "sys.sysftproperties". DBCC results for 'sys.sysxmitbody'. There are 0 rows in 0 pages for object "sys.sysxmitbody". DBCC results for 'sys.sysfos'. There are 0 rows in 0 pages for object "sys.sysfos". DBCC results for 'sys.sysqnames'. There are 1111 rows in 15 pages for object "sys.sysqnames". DBCC results for 'sys.sysxmlcomponent'. There are 6478 rows in 32 pages for object "sys.sysxmlcomponent". DBCC results for 'sys.sysxmlfacet'. There are 392 rows in 3 pages for object "sys.sysxmlfacet". DBCC results for 'sys.sysxmlplacement'. There are 11304 rows in 85 pages for object "sys.sysxmlplacement". DBCC results for 'sys.sysobjkeycrypts'. There are 848 rows in 43 pages for object "sys.sysobjkeycrypts". DBCC results for 'sys.sysasymkeys'. There are 0 rows in 0 pages for object "sys.sysasymkeys". DBCC results for 'sys.syssqlguides'. There are 0 rows in 0 pages for object "sys.syssqlguides". DBCC results for 'sys.sysbinsubobjs'. There are 3 rows in 1 pages for object "sys.sysbinsubobjs". DBCC results for 'sys.syssoftobjrefs'. There are 0 rows in 0 pages for object "sys.syssoftobjrefs". DBCC results for 'sys.sqlagent_jobs'. There are 0 rows in 0 pages for object "sys.sqlagent_jobs". DBCC results for 'sys.sqlagent_jobsteps'. There are 0 rows in 0 pages for object "sys.sqlagent_jobsteps". DBCC results for 'sys.sqlagent_job_history'. There are 0 rows in 0 pages for object "sys.sqlagent_job_history". DBCC results for 'sys.sqlagent_jobsteps_logs'. There are 0 rows in 0 pages for object "sys.sqlagent_jobsteps_logs". DBCC results for 'sys.plan_persist_query_text'. There are 0 rows in 0 pages for object "sys.plan_persist_query_text". DBCC results for 'sys.plan_persist_query'. There are 0 rows in 0 pages for object "sys.plan_persist_query". DBCC results for 'sys.plan_persist_plan'. There are 0 rows in 0 pages for object "sys.plan_persist_plan". DBCC results for 'sys.plan_persist_runtime_stats'. There are 0 rows in 0 pages for object "sys.plan_persist_runtime_stats". DBCC results for 'sys.plan_persist_runtime_stats_interval'. There are 0 rows in 0 pages for object "sys.plan_persist_runtime_stats_interval". DBCC results for 'sys.plan_persist_context_settings'. There are 0 rows in 0 pages for object "sys.plan_persist_context_settings". DBCC results for 'sys.plan_persist_query_hints'. There are 0 rows in 0 pages for object "sys.plan_persist_query_hints". DBCC results for 'sys.plan_persist_query_template_parameterization'. There are 0 rows in 0 pages for object "sys.plan_persist_query_template_parameterization". DBCC results for 'sys.plan_persist_wait_stats'. There are 0 rows in 0 pages for object "sys.plan_persist_wait_stats". DBCC results for 'sys.queue_messages_1977058079'. There are 0 rows in 0 pages for object "sys.queue_messages_1977058079". DBCC results for 'sys.queue_messages_2009058193'. There are 0 rows in 0 pages for object "sys.queue_messages_2009058193". DBCC results for 'sys.queue_messages_2041058307'. There are 0 rows in 0 pages for object "sys.queue_messages_2041058307". DBCC results for 'sys.filestream_tombstone_2073058421'. There are 0 rows in 0 pages for object "sys.filestream_tombstone_2073058421". DBCC results for 'sys.syscommittab'. There are 0 rows in 0 pages for object "sys.syscommittab". DBCC results for 'sys.filetable_updates_2105058535'. There are 0 rows in 0 pages for object "sys.filetable_updates_2105058535". CHECKDB found 0 allocation errors and 0 consistency errors in database 'mssqlsystemresource'. DBCC execution completed. If DBCC printed error messages, contact your system administrator.