diff -Nru xwayland-22.1.1/debian/changelog xwayland-22.1.1/debian/changelog
--- xwayland-22.1.1/debian/changelog	2023-03-29 13:05:35.000000000 +0000
+++ xwayland-22.1.1/debian/changelog	2023-10-16 13:20:53.000000000 +0000
@@ -1,3 +1,13 @@
+xwayland (2:22.1.1-1ubuntu0.7) jammy-security; urgency=medium
+
+  * SECURITY UPDATE: OOB write in XIChangeDeviceProperty and
+    RRChangeOutputProperty
+    - debian/patches/CVE-2023-5367.patch: fix handling of PropModeAppend
+      and PropModePrepend in Xi/xiproperty.c, randr/rrproperty.c.
+    - CVE-2023-5367
+
+ -- Marc Deslauriers <marc.deslauriers@ubuntu.com>  Mon, 16 Oct 2023 09:20:53 -0400
+
 xwayland (2:22.1.1-1ubuntu0.6) jammy-security; urgency=medium
 
   * SECURITY UPDATE: Overlay Window Use-After-Free
diff -Nru xwayland-22.1.1/debian/patches/CVE-2023-5367.patch xwayland-22.1.1/debian/patches/CVE-2023-5367.patch
--- xwayland-22.1.1/debian/patches/CVE-2023-5367.patch	1970-01-01 00:00:00.000000000 +0000
+++ xwayland-22.1.1/debian/patches/CVE-2023-5367.patch	2023-10-16 13:20:48.000000000 +0000
@@ -0,0 +1,80 @@
+From 69ceb12e9c9dc42175aba48bb86f2842423d7082 Mon Sep 17 00:00:00 2001
+From: Peter Hutterer <peter.hutterer@who-t.net>
+Date: Tue, 3 Oct 2023 11:53:05 +1000
+Subject: [PATCH xserver 1/4] Xi/randr: fix handling of PropModeAppend/Prepend
+
+The handling of appending/prepending properties was incorrect, with at
+least two bugs: the property length was set to the length of the new
+part only, i.e. appending or prepending N elements to a property with P
+existing elements always resulted in the property having N elements
+instead of N + P.
+
+Second, when pre-pending a value to a property, the offset for the old
+values was incorrect, leaving the new property with potentially
+uninitalized values and/or resulting in OOB memory writes.
+For example, prepending a 3 element value to a 5 element property would
+result in this 8 value array:
+  [N, N, N, ?, ?, P, P, P ] P, P
+                            ^OOB write
+
+The XI2 code is a copy/paste of the RandR code, so the bug exists in
+both.
+
+CVE-2023-5367, ZDI-CAN-22153
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
+---
+ Xi/xiproperty.c    | 4 ++--
+ randr/rrproperty.c | 4 ++--
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c
+index 066ba21fba..d315f04d0e 100644
+--- a/Xi/xiproperty.c
++++ b/Xi/xiproperty.c
+@@ -730,7 +730,7 @@ XIChangeDeviceProperty(DeviceIntPtr dev, Atom property, Atom type,
+                 XIDestroyDeviceProperty(prop);
+             return BadAlloc;
+         }
+-        new_value.size = len;
++        new_value.size = total_len;
+         new_value.type = type;
+         new_value.format = format;
+ 
+@@ -747,7 +747,7 @@ XIChangeDeviceProperty(DeviceIntPtr dev, Atom property, Atom type,
+         case PropModePrepend:
+             new_data = new_value.data;
+             old_data = (void *) (((char *) new_value.data) +
+-                                  (prop_value->size * size_in_bytes));
++                                  (len * size_in_bytes));
+             break;
+         }
+         if (new_data)
+diff --git a/randr/rrproperty.c b/randr/rrproperty.c
+index c2fb9585c6..25469f57b2 100644
+--- a/randr/rrproperty.c
++++ b/randr/rrproperty.c
+@@ -209,7 +209,7 @@ RRChangeOutputProperty(RROutputPtr output, Atom property, Atom type,
+                 RRDestroyOutputProperty(prop);
+             return BadAlloc;
+         }
+-        new_value.size = len;
++        new_value.size = total_len;
+         new_value.type = type;
+         new_value.format = format;
+ 
+@@ -226,7 +226,7 @@ RRChangeOutputProperty(RROutputPtr output, Atom property, Atom type,
+         case PropModePrepend:
+             new_data = new_value.data;
+             old_data = (void *) (((char *) new_value.data) +
+-                                  (prop_value->size * size_in_bytes));
++                                  (len * size_in_bytes));
+             break;
+         }
+         if (new_data)
+-- 
+2.41.0
+
diff -Nru xwayland-22.1.1/debian/patches/series xwayland-22.1.1/debian/patches/series
--- xwayland-22.1.1/debian/patches/series	2023-03-29 13:05:27.000000000 +0000
+++ xwayland-22.1.1/debian/patches/series	2023-10-16 13:20:48.000000000 +0000
@@ -13,3 +13,4 @@
 CVE-2022-4283.patch
 CVE-2023-0494.patch
 CVE-2023-1393.patch
+CVE-2023-5367.patch