diff --git a/pkgs/os-specific/linux/kernel/cve-2016-0728.patch b/pkgs/os-specific/linux/kernel/cve-2016-0728.patch
deleted file mode 100644
index 5eec95c6293..00000000000
--- a/pkgs/os-specific/linux/kernel/cve-2016-0728.patch
+++ /dev/null
@@ -1,78 +0,0 @@
-From 05fd13592b60c3e9873f56705f80ff934e98b046 Mon Sep 17 00:00:00 2001
-From: David Howells <dhowells@redhat.com>
-Date: Mon, 18 Jan 2016 10:53:31 +0000
-Subject: [PATCH] KEYS: Fix keyring ref leak in join_session_keyring()
-
-This fixes CVE-2016-0728.
-
-If a thread is asked to join as a session keyring the keyring that's already
-set as its session, we leak a keyring reference.
-
-This can be tested with the following program:
-
-	#include <stddef.h>
-	#include <stdio.h>
-	#include <sys/types.h>
-	#include <keyutils.h>
-
-	int main(int argc, const char *argv[])
-	{
-		int i = 0;
-		key_serial_t serial;
-
-		serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING,
-				"leaked-keyring");
-		if (serial < 0) {
-			perror("keyctl");
-			return -1;
-		}
-
-		if (keyctl(KEYCTL_SETPERM, serial,
-			   KEY_POS_ALL | KEY_USR_ALL) < 0) {
-			perror("keyctl");
-			return -1;
-		}
-
-		for (i = 0; i < 100; i++) {
-			serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING,
-					"leaked-keyring");
-			if (serial < 0) {
-				perror("keyctl");
-				return -1;
-			}
-		}
-
-		return 0;
-	}
-
-If, after the program has run, there something like the following line in
-/proc/keys:
-
-3f3d898f I--Q---   100 perm 3f3f0000     0     0 keyring   leaked-keyring: empty
-
-with a usage count of 100 * the number of times the program has been run,
-then the kernel is malfunctioning.  If leaked-keyring has zero usages or
-has been garbage collected, then the problem is fixed.
-
-Reported-by: Yevgeny Pats <yevgeny@perception-point.io>
-Signed-off-by: David Howells <dhowells@redhat.com>
-RH-bugzilla: 1298036
----
- security/keys/process_keys.c | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
-index 43b4cddbf2b3..7877e5cd4e23 100644
---- a/security/keys/process_keys.c
-+++ b/security/keys/process_keys.c
-@@ -794,6 +794,7 @@ long join_session_keyring(const char *name)
- 		ret = PTR_ERR(keyring);
- 		goto error2;
- 	} else if (keyring == new->session_keyring) {
-+		key_put(keyring);
- 		ret = 0;
- 		goto error2;
- 	}
--- 
-2.5.0
-
diff --git a/pkgs/os-specific/linux/kernel/linux-4.3.nix b/pkgs/os-specific/linux/kernel/linux-4.3.nix
index 8d590a72d74..c8a994ba0b3 100644
--- a/pkgs/os-specific/linux/kernel/linux-4.3.nix
+++ b/pkgs/os-specific/linux/kernel/linux-4.3.nix
@@ -1,17 +1,15 @@
 { stdenv, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
-  version = "4.3.3";
+  version = "4.3.4";
 
   extraMeta.branch = "4.3";
 
   src = fetchurl {
     url = "mirror://kernel/linux/kernel/v4.x/linux-${version}.tar.xz";
-    sha256 = "8cad4ce7d049c2ecc041b0844bd478bf85f0d3071c93e0c885a776d57cbca3cf";
+    sha256 = "0vcsvnpxkpxiidlbw3cy1kl02hfml2jy3cbrvwj2nc4a9y5fb3hj";
   };
 
-  kernelPatches = args.kernelPatches ++ [ { name = "cve-2016-0728"; patch = ./cve-2016-0728.patch; } ];
-
   features.iwlwifi = true;
   features.efiBootStub = true;
   features.needsCifsUtils = true;
diff --git a/pkgs/os-specific/linux/kernel/patches.nix b/pkgs/os-specific/linux/kernel/patches.nix
index c74c4c5a944..7e95f1dedb1 100644
--- a/pkgs/os-specific/linux/kernel/patches.nix
+++ b/pkgs/os-specific/linux/kernel/patches.nix
@@ -87,10 +87,10 @@ rec {
     };
 
   grsecurity_unstable = grsecPatch
-    { kversion  = "4.3.3";
-      revision  = "201601051958";
+    { kversion  = "4.3.4";
+      revision  = "201601231215";
       branch    = "test";
-      sha256    = "0hdf9fp5kyd9g8p3qp76jwqvqf561k61wynsq7q9aabvy0p1s18k";
+      sha256    = "1dacld4zlp8mk6ykc0f1v5crppvq3znbdw9rwfrf6qi90984x0mr";
     };
 
   grsec_fix_path =