diff --git a/target/linux/adm5120/Makefile b/target/linux/adm5120/Makefile
index 3634565fbc..034a48b731 100644
--- a/target/linux/adm5120/Makefile
+++ b/target/linux/adm5120/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 BOARD:=adm5120
 BOARDNAME:=Infineon/ADMtek ADM5120
-LINUX_VERSION:=2.6.27.19
+LINUX_VERSION:=2.6.27.21
 SUBTARGETS:=router_le router_be
 INITRAMFS_EXTRA_FILES:=
 
diff --git a/target/linux/au1000/Makefile b/target/linux/au1000/Makefile
index 5cbdd592c7..131368729c 100644
--- a/target/linux/au1000/Makefile
+++ b/target/linux/au1000/Makefile
@@ -12,7 +12,7 @@ BOARDNAME:=RMI/AMD AU1x00
 FEATURES:=jffs2 usb pci
 SUBTARGETS=au1500 au1550
 
-LINUX_VERSION:=2.6.27.19
+LINUX_VERSION:=2.6.27.21
 
 include $(INCLUDE_DIR)/target.mk
 DEFAULT_PACKAGES += hostapd-mini yamonenv
diff --git a/target/linux/brcm63xx/Makefile b/target/linux/brcm63xx/Makefile
index aaf3e8f863..de1489849c 100644
--- a/target/linux/brcm63xx/Makefile
+++ b/target/linux/brcm63xx/Makefile
@@ -10,7 +10,7 @@ ARCH:=mips
 BOARD:=brcm63xx
 BOARDNAME:=Broadcom BCM63xx
 FEATURES:=squashfs jffs2 usb atm pci
-LINUX_VERSION:=2.6.27.19
+LINUX_VERSION:=2.6.27.21
 
 include $(INCLUDE_DIR)/target.mk
 
diff --git a/target/linux/olpc/Makefile b/target/linux/olpc/Makefile
index cb9fe3cda3..b83a239608 100644
--- a/target/linux/olpc/Makefile
+++ b/target/linux/olpc/Makefile
@@ -11,7 +11,7 @@ BOARD:=olpc
 BOARDNAME:=OLPC XO-1
 FEATURES:=squashfs ext2
 
-LINUX_VERSION:=2.6.27.19
+LINUX_VERSION:=2.6.27.21
 
 include $(INCLUDE_DIR)/target.mk
 DEFAULT_PACKAGES += kmod-natsemi kmod-ne2k-pci
diff --git a/target/linux/ppc40x/Makefile b/target/linux/ppc40x/Makefile
index e517d1d7b3..257fd3fd69 100644
--- a/target/linux/ppc40x/Makefile
+++ b/target/linux/ppc40x/Makefile
@@ -11,7 +11,7 @@ BOARD:=ppc40x
 BOARDNAME:=AMCC/IBM PPC40x
 FEATURES:=squashfs
 
-LINUX_VERSION:=2.6.27.19
+LINUX_VERSION:=2.6.27.21
 LINUX_KARCH:=powerpc
 
 include $(INCLUDE_DIR)/target.mk