diff --git a/repos/ports/lib/mk/virtualbox5-common.inc b/repos/ports/lib/mk/virtualbox5-common.inc
index d098c808a1..c7a88e43b5 100644
--- a/repos/ports/lib/mk/virtualbox5-common.inc
+++ b/repos/ports/lib/mk/virtualbox5-common.inc
@@ -62,7 +62,7 @@ VBOX_CC_OPT += -DVBOX_WITH_GUEST_PROPS
 
 VIRTUALBOX_VERSION_MAJOR := $(shell cat $(VIRTUALBOX_DIR)/Config.kmk 2>/dev/null | grep "VBOX_VERSION_MAJOR = " | grep -v "'VBOX_VERSION_MAJOR" | sed "s/^.*= //")
 VIRTUALBOX_VERSION_MINOR := $(shell cat $(VIRTUALBOX_DIR)/Config.kmk 2>/dev/null | grep "VBOX_VERSION_MINOR = " | grep -v "'VBOX_VERSION_MINOR" | sed "s/^.*= //")
-VIRTUALBOX_VERSION_BUILD := $(shell cat $(VIRTUALBOX_DIR)/Config.kmk 2>/dev/null | grep "VBOX_VERSION_BUILD = " | grep -v "'VBOX_VERSION_BUILD" | sed "s/^.*= //")
+VIRTUALBOX_VERSION_BUILD := $(shell cat $(VIRTUALBOX_DIR)/Config.kmk 2>/dev/null | grep "VBOX_VERSION_BUILD = " | grep -v "'VBOX_VERSION_BUILD" | sed "s/^.*= *//")
 
 ifeq ($(VBOX_MACH),x86_32)
 VIRTUALBOX_PACKAGE_STRING = GenodeOS_32BIT_GENERIC
diff --git a/repos/ports/lib/mk/virtualbox5-devices.mk b/repos/ports/lib/mk/virtualbox5-devices.mk
index efef2dcb24..ece8c50ee8 100644
--- a/repos/ports/lib/mk/virtualbox5-devices.mk
+++ b/repos/ports/lib/mk/virtualbox5-devices.mk
@@ -51,6 +51,7 @@ SRC_CC += Devices/Audio/DevHDA.cpp
 SRC_CC += Devices/Audio/DevIchAc97.cpp
 SRC_CC += Devices/Audio/DrvAudioCommon.cpp
 SRC_CC += Devices/Audio/HDACodec.cpp
+SRC_CC += Devices/Audio/HDAStreamPeriod.cpp
 SRC_CC += Devices/USB/DevOHCI.cpp
 SRC_CC += Devices/USB/USBProxyDevice.cpp
 SRC_CC += Devices/USB/VUSBBufferedPipe.cpp
diff --git a/repos/ports/ports/virtualbox5.hash b/repos/ports/ports/virtualbox5.hash
index 2f6645fd92..464811e63a 100644
--- a/repos/ports/ports/virtualbox5.hash
+++ b/repos/ports/ports/virtualbox5.hash
@@ -1 +1 @@
-585d9e845521cbdc189dbc37f7639b9d3428c125
+8866cdf82e328b96fea75a7c7798b24d42f4257e
diff --git a/repos/ports/ports/virtualbox5.port b/repos/ports/ports/virtualbox5.port
index 5ccaf42870..c42946bfdf 100644
--- a/repos/ports/ports/virtualbox5.port
+++ b/repos/ports/ports/virtualbox5.port
@@ -1,17 +1,17 @@
 LICENSE         := GPLv2
-VERSION         := 5.1.22
+VERSION         := 5.1.24
 DOWNLOADS       := virtualbox.archive virtualbox_sdk.archive
 
 VIRTUALBOX_TBZ2    := VirtualBox-$(VERSION).tar.bz2
-VIRTUALBOX_SDK_ZIP := VirtualBoxSDK-$(VERSION)-115126.zip
+VIRTUALBOX_SDK_ZIP := VirtualBoxSDK-$(VERSION)-117012.zip
 
 URL(virtualbox) := http://download.virtualbox.org/virtualbox/$(VERSION)/$(VIRTUALBOX_TBZ2)
 DIR(virtualbox) := src/app/virtualbox
-SHA(virtualbox) := 57e6f73f62af7d5ddb670972ba0417b6fcb43950
+SHA(virtualbox) := ed7d807ac89455517ec2c32cf83e931b16b2b4b8
 
 URL(virtualbox_sdk) := http://download.virtualbox.org/virtualbox/$(VERSION)/$(VIRTUALBOX_SDK_ZIP)
 DIR(virtualbox_sdk) := src/app/virtualbox_sdk
-SHA(virtualbox_sdk) := 21b45da69214b32cf7f7115ef53e0c1d77ae2434
+SHA(virtualbox_sdk) := 1cb99cb6f24dd17e7ff2ea2f1e079f41e5d99293
 
 PATCHES_DIR       := src/virtualbox5/patches
 PATCHES_DIR_VBOX4 := src/virtualbox/patches
diff --git a/repos/ports/src/virtualbox5/audio.cc b/repos/ports/src/virtualbox5/audio.cc
index f40f66217a..9b3fee334e 100644
--- a/repos/ports/src/virtualbox5/audio.cc
+++ b/repos/ports/src/virtualbox5/audio.cc
@@ -146,7 +146,7 @@ static uint32_t write_samples(GenodeVoiceOut *out,
 	Audio_out::Connection * const c = &*out->audio[0];
 
 	/* samples in byte available for sending out */
-	uint32_t samples = RT_MIN(AudioMixBufAvail(mixer_buf),
+	uint32_t samples = RT_MIN(AudioMixBufLive(mixer_buf),
 	                          OUT_SAMPLES - out->sample_pos);
 	uint32_t written_samples = 0;
 
@@ -211,7 +211,7 @@ static uint32_t write_samples(GenodeVoiceOut *out,
 		}
 
 		/* check for additional samples */
-		samples = RT_MIN(AudioMixBufAvail(mixer_buf),
+		samples = RT_MIN(AudioMixBufLive(mixer_buf),
 		                 OUT_SAMPLES - out->sample_pos);
 	}
 
diff --git a/repos/ports/src/virtualbox5/patches/audio.patch b/repos/ports/src/virtualbox5/patches/audio.patch
new file mode 100644
index 0000000000..ba0643606d
--- /dev/null
+++ b/repos/ports/src/virtualbox5/patches/audio.patch
@@ -0,0 +1,48 @@
+--- a/src/app/virtualbox/src/VBox/Devices/Audio/HDAStreamPeriod.cpp
++++ b/src/app/virtualbox/src/VBox/Devices/Audio/HDAStreamPeriod.cpp
+@@ -167,7 +167,9 @@
+  */
+ void hdaStreamPeriodEnd(PHDASTREAMPERIOD pPeriod)
+ {
++#ifdef DEBUG
+     Log3Func(("[SD%RU8] Took %zuus\n", pPeriod->u8SD, (RTTimeNanoTS() - pPeriod->Dbg.tsStartNs) / 1000));
++#endif
+ 
+     if (!(pPeriod->fStatus & HDASTREAMPERIOD_FLAG_ACTIVE))
+         return;
+--- a/src/app/virtualbox/src/VBox/Devices/Audio/DrvAudio.cpp
++++ b/src/app/virtualbox/src/VBox/Devices/Audio/DrvAudio.cpp
+@@ -1584,8 +1584,10 @@
+ #endif
+         uint32_t cbAvail             = AUDIOMIXBUF_S2B(&pHstStrmOut->MixBuf, AudioMixBufUsed(&pHstStrmOut->MixBuf));
+ 
++#ifdef DEBUG
+         Log2Func(("[%s] %RU64ms (%zu bytes) elapsed, %zu bytes available\n",
+                   pHstStrmOut->MixBuf.pszName, tsLastPlayedDeltaMs, cbElapsed, cbAvail));
++#endif
+ 
+         if (!cbAvail) /* Nothing to play back? Skip. */
+             continue;
+--- a/src/app/virtualbox/src/VBox/Devices/Audio/DevHDA.cpp
++++ b/src/app/virtualbox/src/VBox/Devices/Audio/DevHDA.cpp
+@@ -1273,9 +1273,9 @@
+                           pszSource, tsAssertedElapsedNs / 1000,
+                           avgAssertedUs,
+                           (pThis->Dbg.IRQ.tsDeassertedNs - pThis->Dbg.IRQ.tsAssertedNs) / 1000));
+-#endif
+             Log3Func(("Asserted (%s): %RU64us between alternation (WALCLK=%RU64)\n",
+                       pszSource, tsLastElapsedNs / 1000, pThis->u64WalClk));
++#endif
+ 
+             PDMDevHlpPCISetIrq(pThis->CTX_SUFF(pDevIns), 0, 1 /* Assert */);
+             pThis->u8IRQL = 1;
+@@ -4021,7 +4021,9 @@
+     uint32_t csPerPeriod = (int)((strmProps.cChannels * cTicksElapsed * 48000 /* Hz */ + cTicksPerSec) / cTicksPerSec / 2);
+     uint32_t cbPerPeriod = csPerPeriod << strmProps.cShift;
+ 
++#ifdef DEBUG
+     Log3Func(("[SD%RU8] %RU64ms (%zu samples, %zu bytes) elapsed\n", pStream->u8SD, cMsElapsed, csPerPeriod, cbPerPeriod));
++#endif
+ 
+     return cbPerPeriod;
+ }
diff --git a/repos/ports/src/virtualbox5/patches/series b/repos/ports/src/virtualbox5/patches/series
index b559af1b29..93c48641fa 100644
--- a/repos/ports/src/virtualbox5/patches/series
+++ b/repos/ports/src/virtualbox5/patches/series
@@ -11,3 +11,4 @@ vm.patch
 mm.patch
 substr.patch
 vusburb.patch
+audio.patch
diff --git a/repos/ports/src/virtualbox5/sup.cc b/repos/ports/src/virtualbox5/sup.cc
index e3bc7bf9f2..f4c241c6ea 100644
--- a/repos/ports/src/virtualbox5/sup.cc
+++ b/repos/ports/src/virtualbox5/sup.cc
@@ -212,6 +212,11 @@ SUPR3DECL(int) SUPR3PageFreeEx(void *pvPages, size_t cPages)
 }
 
 
+int SUPR3QueryMicrocodeRev(uint32_t *puMicrocodeRev)
+{
+	return E_FAIL;
+}
+
 uint32_t SUPSemEventMultiGetResolution(PSUPDRVSESSION)
 {
 	return 100000*10; /* called by 'vmR3HaltGlobal1Init' */