diff --git a/glibc-RHEL-19862.patch b/glibc-RHEL-19862.patch
new file mode 100644
index 0000000..f3aa27c
--- /dev/null
+++ b/glibc-RHEL-19862.patch
@@ -0,0 +1,27 @@
+commit ecc7c3deb9f347649c2078fcc0f94d4cedf92d60
+Author: Florian Weimer <fweimer@redhat.com>
+Date:   Tue Jan 2 14:36:17 2024 +0100
+
+    libio: Check remaining buffer size in _IO_wdo_write (bug 31183)
+    
+    The multibyte character needs to fit into the remaining buffer space,
+    not the already-written buffer space.  Without the fix, we were never
+    moving the write pointer from the start of the buffer, always using
+    the single-character fallback buffer.
+    
+    Fixes commit 04b76b5aa8b2d1d19066e42dd1 ("Don't error out writing
+    a multibyte character to an unbuffered stream (bug 17522)").
+
+diff --git a/libio/wfileops.c b/libio/wfileops.c
+index 37f44780f811bd38..6cbc3c7c968f9136 100644
+--- a/libio/wfileops.c
++++ b/libio/wfileops.c
+@@ -57,7 +57,7 @@ _IO_wdo_write (FILE *fp, const wchar_t *data, size_t to_do)
+ 	  char mb_buf[MB_LEN_MAX];
+ 	  char *write_base, *write_ptr, *buf_end;
+ 
+-	  if (fp->_IO_write_ptr - fp->_IO_write_base < sizeof (mb_buf))
++	  if (fp->_IO_buf_end - fp->_IO_write_ptr < sizeof (mb_buf))
+ 	    {
+ 	      /* Make sure we have room for at least one multibyte
+ 		 character.  */
diff --git a/glibc.spec b/glibc.spec
index 995a420..083d8e5 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -155,7 +155,7 @@ end \
 Summary: The GNU libc libraries
 Name: glibc
 Version: %{glibcversion}
-Release: 96%{?dist}
+Release: 97%{?dist}
 
 # In general, GPLv2+ is used by programs, LGPLv2+ is used for
 # libraries.
@@ -799,6 +799,7 @@ Patch562: glibc-RHEL-17319-3.patch
 Patch563: glibc-RHEL-17319-4.patch
 Patch564: glibc-RHEL-17465-1.patch
 Patch565: glibc-RHEL-17465-2.patch
+Patch566: glibc-RHEL-19862.patch
 
 ##############################################################################
 # Continued list of core "glibc" package information:
@@ -2957,6 +2958,9 @@ update_gconv_modules_cache ()
 %endif
 
 %changelog
+* Tue Jan  2 2024 Florian Weimer <fweimer@redhat.com> - 2.34-97
+- Re-enable output buffering for wide stdio streams (RHEL-19862)
+
 * Thu Dec 21 2023 Carlos O'Donell <carlos@redhat.com> - 2.34-96
 - Fix TLS corruption during dlopen()/dlclose() sequences (RHEL-17465)