diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 3fe8239fd8fb..debd851de6ff 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1531,6 +1531,13 @@ ENTRY(nmi)
 	/* Use %rdx as out temp variable throughout */
 	pushq_cfi %rdx
 
+	/*
+	 * If %cs was not the kernel segment, then the NMI triggered in user
+	 * space, which means it is definitely not nested.
+	 */
+	cmp $__KERNEL_CS, 16(%rsp)
+	jne first_nmi
+
 	/*
 	 * Check the special variable on the stack to see if NMIs are
 	 * executing.