diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index 67ebf5751222..c439ec478216 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -348,6 +348,12 @@ static __user void *task_get_bounds_dir(struct task_struct *tsk)
 	if (!cpu_feature_enabled(X86_FEATURE_MPX))
 		return MPX_INVALID_BOUNDS_DIR;
 
+	/*
+	 * 32-bit binaries on 64-bit kernels are currently
+	 * unsupported.
+	 */
+	if (IS_ENABLED(CONFIG_X86_64) && test_thread_flag(TIF_IA32))
+		return MPX_INVALID_BOUNDS_DIR;
 	/*
 	 * The bounds directory pointer is stored in a register
 	 * only accessible if we first do an xsave.