diff --git a/dll/ntdll/CMakeLists.txt b/dll/ntdll/CMakeLists.txt
index 6882571577b..cfdf32c3980 100644
--- a/dll/ntdll/CMakeLists.txt
+++ b/dll/ntdll/CMakeLists.txt
@@ -67,7 +67,7 @@ set_module_type(ntdll win32dll ENTRYPOINT 0)
 set_subsystem(ntdll console)
 ################# END  HACK #################
 
-target_link_libraries(ntdll ntdll_vista_static etwtrace csrlib rtl rtl_um rtl_vista ntdllsys libcntpr setjmp uuid ${PSEH_LIB})
+target_link_libraries(ntdll ntdll_vista_static etwtrace csrlib rtl rtl_um rtl_vista ntdllsys ntdllsys_nt6 libcntpr setjmp uuid ${PSEH_LIB})
 if(DLL_EXPORT_VERSION GREATER_EQUAL 0x600)
     target_link_libraries(ntdll cryptlib ntdllsys_nt6)
 endif()
diff --git a/dll/ntdll/def/ntdll.spec b/dll/ntdll/def/ntdll.spec
index 46bd5a85f57..b815c5cb626 100644
--- a/dll/ntdll/def/ntdll.spec
+++ b/dll/ntdll/def/ntdll.spec
@@ -879,6 +879,7 @@
 @ stdcall RtlGetCurrentDirectory_U(long ptr)
 @ stdcall RtlGetCurrentPeb()
 @ stdcall RtlGetCurrentProcessorNumber() ; 5.2 SP1 and higher
+@ stdcall -version=0x601+ RtlGetCurrentProcessorNumberEx(ptr)
 @ stdcall -stub -version=0x600+ RtlGetCurrentTransaction()
 @ stdcall RtlGetDaclSecurityDescriptor(ptr ptr ptr ptr)
 @ stdcall RtlGetElementGenericTable(ptr long)
@@ -999,6 +1000,7 @@
 @ stdcall RtlIsGenericTableEmptyAvl(ptr)
 @ stdcall RtlIsNameLegalDOS8Dot3(ptr ptr ptr)
 @ stdcall -stub -version=0x600+ RtlIsNormalizedString(long ptr long ptr)
+@ stdcall -version=0xA00+ RtlIsProcessorFeaturePresent(long)
 @ stdcall RtlIsTextUnicode(ptr long ptr)
 @ stdcall RtlIsThreadWithinLoaderCallout()
 @ stdcall RtlIsValidHandle(ptr ptr)
diff --git a/dll/ntdll/nt_0600/ntdll_vista.spec b/dll/ntdll/nt_0600/ntdll_vista.spec
index 859f47e1c6c..734929f4d81 100644
--- a/dll/ntdll/nt_0600/ntdll_vista.spec
+++ b/dll/ntdll/nt_0600/ntdll_vista.spec
@@ -25,8 +25,10 @@
 @ stdcall RtlLcidToLocaleName(long ptr long long)
 @ stdcall RtlLocaleNameToLcid(wstr ptr long)
 @ stdcall RtlCompareUnicodeStrings(wstr long wstr long long)
+@ stdcall RtlGetCurrentProcessorNumberEx(ptr)
 @ stdcall -arch=i386 RtlInterlockedPushListSListEx(ptr ptr ptr long)
 @ stdcall -arch=!i386 RtlInterlockedPushListSListEx(ptr ptr ptr long) ntdll.RtlInterlockedPushListSList
+@ stdcall RtlIsProcessorFeaturePresent(long)
 
 @ stdcall RtlUnicodeToUTF8N(ptr long ptr wstr long)
 @ stdcall RtlUTF8ToUnicodeN(ptr long ptr str long)
diff --git a/sdk/lib/rtl/CMakeLists.txt b/sdk/lib/rtl/CMakeLists.txt
index c03d68d934d..8ed33de2e2c 100644
--- a/sdk/lib/rtl/CMakeLists.txt
+++ b/sdk/lib/rtl/CMakeLists.txt
@@ -70,6 +70,7 @@ list(APPEND SOURCE
     prefix.c
     priv.c
     process.c
+    processor.c
     propvar.c
     random.c
     rangelist.c
@@ -138,6 +139,7 @@ list(APPEND SOURCE_VISTA
     ${RTL_WINE_SOURCE_VISTA}
     condvar.c
     locale.c
+    processor.c
     runonce.c
     slist.c
     srw.c
diff --git a/sdk/lib/rtl/process.c b/sdk/lib/rtl/process.c
index c978e7b2399..3cd53000921 100644
--- a/sdk/lib/rtl/process.c
+++ b/sdk/lib/rtl/process.c
@@ -486,14 +486,6 @@ RtlSetProcessIsCritical(IN BOOLEAN NewValue,
                                    sizeof(ULONG));
 }
 
-ULONG
-NTAPI
-RtlGetCurrentProcessorNumber(VOID)
-{
-    /* Forward to kernel */
-    return NtGetCurrentProcessorNumber();
-}
-
 _IRQL_requires_max_(APC_LEVEL)
 ULONG
 NTAPI
diff --git a/sdk/lib/rtl/processor.c b/sdk/lib/rtl/processor.c
new file mode 100644
index 00000000000..39855193560
--- /dev/null
+++ b/sdk/lib/rtl/processor.c
@@ -0,0 +1,45 @@
+/*
+ * PROJECT:     ReactOS runtime library (RTL)
+ * LICENSE:     MIT (https://spdx.org/licenses/MIT)
+ * PURPOSE:     Implementation of processor related routines
+ * COPYRIGHT:   Copyright 2026 Timo Kreuzer <timo.kreuzer@reactos.org>
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include <rtl.h>
+
+#define NDEBUG
+#include <debug.h>
+
+/* FUNCTIONS *****************************************************************/
+
+
+BOOLEAN
+NTAPI
+RtlIsProcessorFeaturePresent(
+    _In_ ULONG ProcessorFeature)
+{
+    if (ProcessorFeature >= RTL_NUMBER_OF(SharedUserData->ProcessorFeatures))
+    {
+        return FALSE;
+    }
+
+    return SharedUserData->ProcessorFeatures[ProcessorFeature] != 0;
+}
+
+ULONG
+NTAPI
+RtlGetCurrentProcessorNumber(
+    VOID)
+{
+    return NtGetCurrentProcessorNumber();
+}
+
+VOID
+NTAPI
+RtlGetCurrentProcessorNumberEx(
+    _Out_ PPROCESSOR_NUMBER ProcessorNumber)
+{
+    NtGetCurrentProcessorNumberEx(ProcessorNumber);
+}