doc/releases: add release note about "invalid regex" bug in mgr

Signed-off-by: Laura Flores <[email protected]>

doc/releases/quincy.rst

@@ -5,6 +5,27 @@ Quincy
 Quincy is the 17th stable release of Ceph.  It is named after Squidward
 Quincy Tentacles from Spongebob Squarepants.
 
+v17.2.3 Quincy
+==============
+
+This is a hotfix release that addresses a libcephsqlite crash in the mgr.
+
+Notable Changes
+---------------
+* A libcephsqlite bug that caused the mgr to crash repeatedly and die is now
+  fixed. The bug was exposed due to 17.2.2 being built with gcc 8.5.0-14, which contains
+  a new patch to check for invalid regex. 17.2.1 was built using gcc 8.5.0-13, which
+  does not contain the invalid regex patch.
+
+  Relevant tracker: https://tracker.ceph.com/issues/55304
+
+  Relevant BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2110797
+
+Changelog
+---------
+
+* libcephsqlite: ceph-mgr crashes when compiled with gcc12 (`pr#47270 <https://github.com/ceph/ceph/pull/47270>`_, Ganesh Maharaj Mahalingam)
+
 v17.2.2 Quincy
 ==============