diff --git a/repos/ports/ports/virtualbox.hash b/repos/ports/ports/virtualbox.hash
index 14571b6c4..35b0c24a3 100644
--- a/repos/ports/ports/virtualbox.hash
+++ b/repos/ports/ports/virtualbox.hash
@@ -1 +1 @@
-b925f6284e93e4865b1ee6a4b1e8c63e4e9611e0
+8b8762f34e586d96ec89085422452342c6908f80
diff --git a/repos/ports/ports/virtualbox5.hash b/repos/ports/ports/virtualbox5.hash
index c185491d2..4d562db2b 100644
--- a/repos/ports/ports/virtualbox5.hash
+++ b/repos/ports/ports/virtualbox5.hash
@@ -1 +1 @@
-cc217111ff4444b66fb90dd688c09cefce6e4110
+720a329b2f1eb7b71e8b3c7542b9f744224d370a
diff --git a/repos/ports/src/virtualbox/patches/rem_tss.patch b/repos/ports/src/virtualbox/patches/rem_tss.patch
new file mode 100644
index 000000000..e1a74c78b
--- /dev/null
+++ b/repos/ports/src/virtualbox/patches/rem_tss.patch
@@ -0,0 +1,34 @@
+--- a/src/app/virtualbox/src/recompiler/VBoxRecompiler.c
+--- b/src/app/virtualbox/src/recompiler/VBoxRecompiler.c
+@@ -2664,13 +2664,14 @@
+ #endif
+     }
+ 
++    bool busy_set = ((pCtx->tr.Attr.u & SEL_FLAGS_SMASK) << SEL_FLAGS_SHIFT) & DESC_TSS_BUSY_MASK;
+     if (    pCtx->tr.Sel      != pVM->rem.s.Env.tr.selector
+         ||  pCtx->tr.ValidSel != pVM->rem.s.Env.tr.selector
+         ||  pCtx->tr.u64Base  != pVM->rem.s.Env.tr.base
+         ||  pCtx->tr.u32Limit != pVM->rem.s.Env.tr.limit
+             /* Qemu and AMD/Intel have different ideas about the busy flag ... */ /** @todo just fix qemu! */
+         ||  pCtx->tr.Attr.u   != (  (pVM->rem.s.Env.tr.flags >> SEL_FLAGS_SHIFT) & (SEL_FLAGS_SMASK & ~DESC_INTEL_UNUSABLE)
+-                                  ? (pVM->rem.s.Env.tr.flags | DESC_TSS_BUSY_MASK) >> SEL_FLAGS_SHIFT
++                                  ? (pVM->rem.s.Env.tr.flags | (busy_set ? DESC_TSS_BUSY_MASK : 0)) >> SEL_FLAGS_SHIFT
+                                   : 0)
+         ||  !(pCtx->tr.fFlags & CPUMSELREG_FLAGS_VALID)
+        )
+@@ -2905,13 +2906,14 @@
+ #endif
+     }
+ 
++    bool busy_set = ((pCtx->tr.Attr.u & SEL_FLAGS_SMASK) << SEL_FLAGS_SHIFT) & DESC_TSS_BUSY_MASK;
+     if (    pCtx->tr.Sel      != pVM->rem.s.Env.tr.selector
+         ||  pCtx->tr.ValidSel != pVM->rem.s.Env.tr.selector
+         ||  pCtx->tr.u64Base  != pVM->rem.s.Env.tr.base
+         ||  pCtx->tr.u32Limit != pVM->rem.s.Env.tr.limit
+             /* Qemu and AMD/Intel have different ideas about the busy flag ... */
+         ||  pCtx->tr.Attr.u   != (  (pVM->rem.s.Env.tr.flags >> SEL_FLAGS_SHIFT) & (SEL_FLAGS_SMASK & ~DESC_INTEL_UNUSABLE)
+-                                  ? (pVM->rem.s.Env.tr.flags | DESC_TSS_BUSY_MASK) >> SEL_FLAGS_SHIFT
++                                  ? (pVM->rem.s.Env.tr.flags | (busy_set ? DESC_TSS_BUSY_MASK : 0)) >> SEL_FLAGS_SHIFT
+                                   : 0)
+         ||  !(pCtx->tr.fFlags & CPUMSELREG_FLAGS_VALID)
+        )
diff --git a/repos/ports/src/virtualbox/patches/series_common b/repos/ports/src/virtualbox/patches/series_common
index f838bcb62..e3b8265ca 100644
--- a/repos/ports/src/virtualbox/patches/series_common
+++ b/repos/ports/src/virtualbox/patches/series_common
@@ -15,3 +15,4 @@ tm_retries.patch
 vmdk.patch
 tm_tpr.patch
 tm_4s.patch
+rem_tss.patch
diff --git a/repos/ports/src/virtualbox/spec/muen/sup.cc b/repos/ports/src/virtualbox/spec/muen/sup.cc
index 8f66e6496..ad090537c 100644
--- a/repos/ports/src/virtualbox/spec/muen/sup.cc
+++ b/repos/ports/src/virtualbox/spec/muen/sup.cc
@@ -320,7 +320,6 @@ inline void check_vm_state(PVMCPU pVCpu, struct Subject_state *cur_state)
 	Assert(cur_state->ldtr.base   == pCtx->ldtr.u64Base);
 	if(cur_state->ldtr.sel != 0)
 		Assert(cur_state->ldtr.access == pCtx->ldtr.Attr.u);
-	Assert(pCtx->tr.Attr.u & X86_SEL_TYPE_SYS_TSS_BUSY_MASK);
 	{
 		Assert(cur_state->tr.sel    == pCtx->tr.Sel);
 		Assert(cur_state->tr.limit  == pCtx->tr.u32Limit);
@@ -455,7 +454,6 @@ int SUPR3CallVMMR0Fast(PVMR0 pVMR0, unsigned uOperation, VMCPUID idCpu)
 			cur_state->ldtr.base   = pCtx->ldtr.u64Base;
 			cur_state->ldtr.access = pCtx->ldtr.Attr.u;
 		}
-		Assert(pCtx->tr.Attr.u & X86_SEL_TYPE_SYS_TSS_BUSY_MASK);
 		{
 			cur_state->tr.sel    = pCtx->tr.Sel;
 			cur_state->tr.limit  = pCtx->tr.u32Limit;
diff --git a/repos/ports/src/virtualbox/spec/nova/vmx.h b/repos/ports/src/virtualbox/spec/nova/vmx.h
index 5913c6f5d..cdfe86c62 100644
--- a/repos/ports/src/virtualbox/spec/nova/vmx.h
+++ b/repos/ports/src/virtualbox/spec/nova/vmx.h
@@ -111,7 +111,6 @@ static inline bool vmx_load_state(Nova::Utcb * utcb, VM * pVM, PVMCPU pVCpu)
 	}
 
 	/* tr */
-	Assert(pCtx->tr.Attr.u & X86_SEL_TYPE_SYS_TSS_BUSY_MASK);
 	{
 		utcb->mtd |= Nova::Mtd::TR;
 
diff --git a/repos/ports/src/virtualbox5/spec/nova/vmx.h b/repos/ports/src/virtualbox5/spec/nova/vmx.h
index 5913c6f5d..cdfe86c62 100644
--- a/repos/ports/src/virtualbox5/spec/nova/vmx.h
+++ b/repos/ports/src/virtualbox5/spec/nova/vmx.h
@@ -111,7 +111,6 @@ static inline bool vmx_load_state(Nova::Utcb * utcb, VM * pVM, PVMCPU pVCpu)
 	}
 
 	/* tr */
-	Assert(pCtx->tr.Attr.u & X86_SEL_TYPE_SYS_TSS_BUSY_MASK);
 	{
 		utcb->mtd |= Nova::Mtd::TR;