diff --git a/core/glibc/PKGBUILD b/core/glibc/PKGBUILD
index 3549e2e32..1cd4a6c56 100644
--- a/core/glibc/PKGBUILD
+++ b/core/glibc/PKGBUILD
@@ -14,8 +14,8 @@
 noautobuild=1
 
 pkgname=glibc
-pkgver=2.32
-pkgrel=5
+pkgver=2.33
+pkgrel=3
 arch=(x86_64)
 url='https://www.gnu.org/software/libc'
 license=(GPL LGPL)
@@ -28,16 +28,16 @@ source=(https://ftp.gnu.org/gnu/glibc/glibc-$pkgver.tar.xz{,.sig}
         locale.gen.txt
         locale-gen
         sdt.h sdt-config.h
-        bz26534.patch)
+        bz27343.patch)
 validpgpkeys=(7273542B39962DF7B299931416792B4EA25340F8 # Carlos O'Donell
               BC7C7372637EC10C57D7AA6579C43DFBF1CF2187) # Siddhesh Poyarekar
-md5sums=('720c7992861c57cf97d66a2f36d8d1fa'
+md5sums=('390bbd889c7e8e8a7041564cb6b27cca'
          'SKIP'
          '07ac979b6ab5eeb778d55f041529d623'
          '476e9113489f93b348b21e144b6a8fcf'
          '91fec3b7e75510ae2ac42533aa2e695e'
          '680df504c683640b02ed4a805797c0b2'
-         'fc57038c1297c7c11258e8dda1623ec2')
+         'cfe57018d06bf748b8ca1779980fef33')
 
 prepare() {
   mkdir -p glibc-build
@@ -45,14 +45,8 @@ prepare() {
   [[ -d glibc-$pkgver ]] && ln -s glibc-$pkgver glibc 
   cd glibc
 
-  local i; for i in ${source[@]}; do
-    case ${i%::*} in
-      *.patch)
-        echo "  -> Applying ${i}"
-        patch -p1 -i "$srcdir/${i}"
-        ;;
-    esac
-  done
+  # commit c3479fb7939898ec22c655c383454d6e8b982a67
+  patch -p1 -i "$srcdir"/bz27343.patch
 }
 
 build() {
diff --git a/core/glibc/bz26534.patch b/core/glibc/bz26534.patch
deleted file mode 100644
index 5a2fdd8e2..000000000
--- a/core/glibc/bz26534.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- a/sysdeps/x86_64/fpu/multiarch/ifunc-fma4.h 2020-08-25 15:08:15.049364392 +0200
-+++ b/sysdeps/x86_64/fpu/multiarch/ifunc-fma4.h 2020-08-25 15:08:20.012697875 +0200
-@@ -32,7 +32,7 @@
-       && CPU_FEATURE_USABLE_P (cpu_features, AVX2))
-     return OPTIMIZE (fma);
-
--  if (CPU_FEATURE_USABLE_P (cpu_features, FMA))
-+  if (CPU_FEATURE_USABLE_P (cpu_features, FMA4))
-     return OPTIMIZE (fma4);
-
-   return OPTIMIZE (sse2);
diff --git a/core/glibc/bz27343.patch b/core/glibc/bz27343.patch
new file mode 100644
index 000000000..3db6a9440
--- /dev/null
+++ b/core/glibc/bz27343.patch
@@ -0,0 +1,48 @@
+From c3479fb7939898ec22c655c383454d6e8b982a67 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyfox@gentoo.org>
+Date: Fri, 5 Feb 2021 07:32:18 +0000
+Subject: [PATCH] nsswitch: return result when nss database is locked [BZ
+ #27343]
+
+Before the change nss_database_check_reload_and_get() did not populate
+the '*result' value when it returned success in a case of chroot
+detection. This caused initgroups() to use garage pointer in the
+following test (extracted from unbound):
+
+```
+
+int main() {
+    // load some NSS modules
+    struct passwd * pw = getpwnam("root");
+
+    chdir("/tmp");
+    chroot("/tmp");
+    chdir("/");
+    // access nsswitch.conf in a chroot
+    initgroups("root", 0);
+}
+```
+
+Reviewed-by: DJ Delorie <dj@redhat.com>
+---
+ nss/nss_database.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/nss/nss_database.c b/nss/nss_database.c
+index cf0306adc4..e1bef6bd75 100644
+--- a/nss/nss_database.c
++++ b/nss/nss_database.c
+@@ -398,8 +398,9 @@ nss_database_check_reload_and_get (struct nss_database_state *local,
+ 	  && (str.st_ino != local->root_ino
+ 	      ||  str.st_dev != local->root_dev)))
+     {
+-      /* Change detected; disable reloading.  */
++      /* Change detected; disable reloading and return current state.  */
+       atomic_store_release (&local->data.reload_disabled, 1);
++      *result = local->data.services[database_index];
+       __libc_lock_unlock (local->lock);
+       __nss_module_disable_loading ();
+       return true;
+-- 
+2.27.0
+