diff --git a/Kernel/Tasks/PerformanceEventBuffer.cpp b/Kernel/Tasks/PerformanceEventBuffer.cpp
index f0087e1ae45..12d0bdafcf4 100644
--- a/Kernel/Tasks/PerformanceEventBuffer.cpp
+++ b/Kernel/Tasks/PerformanceEventBuffer.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2023, Jakub Berkop <jakub.berkop@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -192,19 +193,24 @@ template<typename Serializer>
 ErrorOr<void> PerformanceEventBuffer::to_json_impl(Serializer& object) const
 {
     {
-        auto strings = TRY(object.add_array("strings"sv));
+        auto strings_object = TRY(object.add_array("strings"sv));
         Vector<KString*> strings_sorted_by_index;
-        TRY(strings_sorted_by_index.try_resize(m_strings.size()));
 
-        for (auto& entry : m_strings) {
-            strings_sorted_by_index[entry.value] = const_cast<Kernel::KString*>(entry.key.ptr());
-        }
+        TRY(m_strings.with([&](auto& strings) -> ErrorOr<void> {
+            TRY(strings_sorted_by_index.try_resize(strings.size()));
 
-        for (size_t i = 0; i < m_strings.size(); i++) {
-            TRY(strings.add(strings_sorted_by_index[i]->view()));
-        }
+            for (auto& entry : strings) {
+                strings_sorted_by_index[entry.value] = const_cast<Kernel::KString*>(entry.key.ptr());
+            }
 
-        TRY(strings.finish());
+            for (size_t i = 0; i < strings.size(); i++) {
+                TRY(strings_object.add(strings_sorted_by_index[i]->view()));
+            }
+
+            return {};
+        }));
+
+        TRY(strings_object.finish());
     }
 
     auto current_process_credentials = Process::current().credentials();
@@ -367,14 +373,16 @@ ErrorOr<void> PerformanceEventBuffer::add_process(Process const& process, Proces
 
 ErrorOr<FlatPtr> PerformanceEventBuffer::register_string(NonnullOwnPtr<KString> string)
 {
-    auto it = m_strings.find(string);
-    if (it != m_strings.end()) {
-        return it->value;
-    }
+    return m_strings.with([&](auto& m_strings) -> ErrorOr<FlatPtr> {
+        auto it = m_strings.find(string);
+        if (it != m_strings.end()) {
+            return it->value;
+        }
 
-    auto new_index = m_strings.size();
-    TRY(m_strings.try_set(move(string), move(new_index)));
-    return new_index;
+        auto new_index = m_strings.size();
+        TRY(m_strings.try_set(move(string), move(new_index)));
+        return new_index;
+    });
 }
 
 }
diff --git a/Kernel/Tasks/PerformanceEventBuffer.h b/Kernel/Tasks/PerformanceEventBuffer.h
index 74233424be9..53eaaf4ee0f 100644
--- a/Kernel/Tasks/PerformanceEventBuffer.h
+++ b/Kernel/Tasks/PerformanceEventBuffer.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2023, Jakub Berkop <jakub.berkop@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -145,7 +146,7 @@ private:
     size_t m_count { 0 };
     NonnullOwnPtr<KBuffer> m_buffer;
 
-    HashMap<NonnullOwnPtr<KString>, size_t> m_strings;
+    SpinlockProtected<HashMap<NonnullOwnPtr<KString>, size_t>, LockRank::None> m_strings;
 };
 
 extern bool g_profiling_all_threads;