diff --git a/src/com/android/settings/DefaultRingtonePreference.java b/src/com/android/settings/DefaultRingtonePreference.java
index 9bf626c..4c65488 100644
--- a/src/com/android/settings/DefaultRingtonePreference.java
+++ b/src/com/android/settings/DefaultRingtonePreference.java
@@ -51,16 +51,9 @@
             return;
         }
 
-        String mimeType = mUserContext.getContentResolver().getType(ringtoneUri);
-        if (mimeType == null) {
+        if (!isValidRingtoneUri(ringtoneUri)) {
             Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
-                    + " ignored: failure to find mimeType (no access from this context?)");
-            return;
-        }
-
-        if (!(mimeType.startsWith("audio/") || mimeType.equals("application/ogg"))) {
-            Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
-                    + " ignored: associated mimeType:" + mimeType + " is not an audio type");
+                    + " ignored: invalid ringtone Uri");
             return;
         }
 
diff --git a/src/com/android/settings/RingtonePreference.java b/src/com/android/settings/RingtonePreference.java
index 8f9c618..d283e39 100644
--- a/src/com/android/settings/RingtonePreference.java
+++ b/src/com/android/settings/RingtonePreference.java
@@ -16,6 +16,8 @@
 
 package com.android.settings;
 
+import android.content.ContentProvider;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.TypedArray;
@@ -23,9 +25,11 @@
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.UserHandle;
+import android.os.UserManager;
 import android.provider.Settings.System;
 import android.text.TextUtils;
 import android.util.AttributeSet;
+import android.util.Log;
 
 import androidx.preference.Preference;
 import androidx.preference.PreferenceManager;
@@ -239,4 +243,82 @@
         return true;
     }
 
+    public boolean isDefaultRingtone(Uri ringtoneUri) {
+        // null URIs are valid (None/silence)
+        return ringtoneUri == null || RingtoneManager.isDefault(ringtoneUri);
+    }
+
+    protected boolean isValidRingtoneUri(Uri ringtoneUri) {
+        if (isDefaultRingtone(ringtoneUri)) {
+            return true;
+        }
+
+        // Return early for android resource URIs
+        if (ContentResolver.SCHEME_ANDROID_RESOURCE.equals(ringtoneUri.getScheme())) {
+            return true;
+        }
+
+        String mimeType = mUserContext.getContentResolver().getType(ringtoneUri);
+        if (mimeType == null) {
+            Log.e(TAG, "isValidRingtoneUri for URI:" + ringtoneUri
+                    + " failed: failure to find mimeType (no access from this context?)");
+            return false;
+        }
+
+        if (!(mimeType.startsWith("audio/") || mimeType.equals("application/ogg")
+                || mimeType.equals("application/x-flac"))) {
+            Log.e(TAG, "isValidRingtoneUri for URI:" + ringtoneUri
+                    + " failed: associated mimeType:" + mimeType + " is not an audio type");
+            return false;
+        }
+
+        // Validate userId from URIs: content://{userId}@...
+        final int userIdFromUri = ContentProvider.getUserIdFromUri(ringtoneUri, mUserId);
+        if (userIdFromUri != mUserId) {
+            final UserManager userManager = mUserContext.getSystemService(UserManager.class);
+
+            if (!userManager.isSameProfileGroup(mUserId, userIdFromUri)) {
+                Log.e(TAG,
+                    "isValidRingtoneUri for URI:" + ringtoneUri + " failed: user " + userIdFromUri
+                        + " and user " + mUserId + " are not in the same profile group");
+                return false;
+            }
+
+            final int parentUserId;
+            final int profileUserId;
+            if (userManager.isProfile()) {
+                profileUserId = mUserId;
+                parentUserId = userIdFromUri;
+            } else {
+                parentUserId = mUserId;
+                profileUserId = userIdFromUri;
+            }
+
+            final UserHandle parent = userManager.getProfileParent(UserHandle.of(profileUserId));
+            if (parent == null || parent.getIdentifier() != parentUserId) {
+                Log.e(TAG,
+                    "isValidRingtoneUri for URI:" + ringtoneUri + " failed: user " + profileUserId
+                        + " is not a profile of user " + parentUserId);
+                return false;
+            }
+
+            // Allow parent <-> managed profile sharing, unless restricted
+            if (userManager.hasUserRestrictionForUser(
+                UserManager.DISALLOW_SHARE_INTO_MANAGED_PROFILE, UserHandle.of(parentUserId))) {
+                Log.e(TAG,
+                    "isValidRingtoneUri for URI:" + ringtoneUri + " failed: user " + parentUserId
+                        + " has restriction: " + UserManager.DISALLOW_SHARE_INTO_MANAGED_PROFILE);
+                return false;
+            }
+
+            if (!userManager.isManagedProfile(profileUserId)) {
+                Log.e(TAG, "isValidRingtoneUri for URI:" + ringtoneUri
+                    + " failed: user " + profileUserId + " is not a managed profile");
+                return false;
+            }
+        }
+
+        return true;
+    }
+
 }
diff --git a/src/com/android/settings/notification/app/NotificationSoundPreference.java b/src/com/android/settings/notification/app/NotificationSoundPreference.java
index 136b21f..b55f9bd 100644
--- a/src/com/android/settings/notification/app/NotificationSoundPreference.java
+++ b/src/com/android/settings/notification/app/NotificationSoundPreference.java
@@ -25,10 +25,13 @@
 import android.os.AsyncTask;
 import android.util.AttributeSet;
 
+import android.util.Log;
 import com.android.settings.R;
 import com.android.settings.RingtonePreference;
 
 public class NotificationSoundPreference extends RingtonePreference {
+    private static final String TAG = "NotificationSoundPreference";
+
     private Uri mRingtone;
 
     public NotificationSoundPreference(Context context, AttributeSet attrs) {
@@ -50,8 +53,13 @@
     public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
         if (data != null) {
             Uri uri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
-            setRingtone(uri);
-            callChangeListener(uri);
+            if (isValidRingtoneUri(uri)) {
+                setRingtone(uri);
+                callChangeListener(uri);
+            } else {
+                Log.e(TAG, "onActivityResult for URI:" + uri
+                    + " ignored: invalid ringtone Uri");
+            }
         }
 
         return true;
diff --git a/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java b/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java
index 7877684..360a8a5 100644
--- a/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java
+++ b/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java
@@ -16,16 +16,19 @@
 
 package com.android.settings;
 
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import android.content.ContentInterface;
 import android.content.ContentResolver;
 import android.content.Context;
-import android.media.RingtoneManager;
 import android.net.Uri;
+import android.os.UserHandle;
+import android.os.UserManager;
 
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
@@ -34,17 +37,22 @@
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
+import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 
 /** Unittest for DefaultRingtonePreference. */
 @RunWith(AndroidJUnit4.class)
 public class DefaultRingtonePreferenceTest {
 
+    private static final int OWNER_USER_ID = 1;
+    private static final int OTHER_USER_ID = 10;
+    private static final int INVALID_RINGTONE_TYPE = 0;
     private DefaultRingtonePreference mDefaultRingtonePreference;
 
     @Mock
     private ContentResolver mContentResolver;
     @Mock
+    private UserManager mUserManager;
     private Uri mRingtoneUri;
 
     @Before
@@ -52,14 +60,24 @@
         MockitoAnnotations.initMocks(this);
 
         Context context = spy(ApplicationProvider.getApplicationContext());
-        doReturn(mContentResolver).when(context).getContentResolver();
+        mContentResolver = ContentResolver.wrap(Mockito.mock(ContentInterface.class));
+        when(context.getContentResolver()).thenReturn(mContentResolver);
 
         mDefaultRingtonePreference = spy(new DefaultRingtonePreference(context, null /* attrs */));
         doReturn(context).when(mDefaultRingtonePreference).getContext();
+
+        // Use INVALID_RINGTONE_TYPE to return early in RingtoneManager.setActualDefaultRingtoneUri
         when(mDefaultRingtonePreference.getRingtoneType())
-                .thenReturn(RingtoneManager.TYPE_RINGTONE);
-        mDefaultRingtonePreference.setUserId(1);
+                .thenReturn(INVALID_RINGTONE_TYPE);
+
+        mDefaultRingtonePreference.setUserId(OWNER_USER_ID);
         mDefaultRingtonePreference.mUserContext = context;
+        when(mDefaultRingtonePreference.isDefaultRingtone(any(Uri.class))).thenReturn(false);
+
+        when(context.getSystemServiceName(UserManager.class)).thenReturn(Context.USER_SERVICE);
+        when(context.getSystemService(Context.USER_SERVICE)).thenReturn(mUserManager);
+
+        mRingtoneUri = Uri.parse("content://none");
     }
 
     @Test
@@ -79,4 +97,53 @@
 
         verify(mDefaultRingtonePreference, never()).setActualDefaultRingtoneUri(mRingtoneUri);
     }
+
+    @Test
+    public void onSaveRingtone_notManagedProfile_shouldNotSetRingtone() {
+        mRingtoneUri = Uri.parse("content://" + OTHER_USER_ID + "@ringtone");
+        when(mContentResolver.getType(mRingtoneUri)).thenReturn("audio/*");
+        when(mUserManager.isSameProfileGroup(OWNER_USER_ID, OTHER_USER_ID)).thenReturn(true);
+        when(mUserManager.getProfileParent(UserHandle.of(OTHER_USER_ID))).thenReturn(
+                UserHandle.of(OWNER_USER_ID));
+        when(mUserManager.isManagedProfile(OTHER_USER_ID)).thenReturn(false);
+
+        mDefaultRingtonePreference.onSaveRingtone(mRingtoneUri);
+
+        verify(mDefaultRingtonePreference, never()).setActualDefaultRingtoneUri(mRingtoneUri);
+    }
+
+    @Test
+    public void onSaveRingtone_notSameUser_shouldNotSetRingtone() {
+        mRingtoneUri = Uri.parse("content://" + OTHER_USER_ID + "@ringtone");
+        when(mContentResolver.getType(mRingtoneUri)).thenReturn("audio/*");
+        when(mUserManager.isSameProfileGroup(OWNER_USER_ID, OTHER_USER_ID)).thenReturn(false);
+
+        mDefaultRingtonePreference.onSaveRingtone(mRingtoneUri);
+
+        verify(mDefaultRingtonePreference, never()).setActualDefaultRingtoneUri(mRingtoneUri);
+    }
+
+    @Test
+    public void onSaveRingtone_isManagedProfile_shouldSetRingtone() {
+        mRingtoneUri = Uri.parse("content://" + OTHER_USER_ID + "@ringtone");
+        when(mContentResolver.getType(mRingtoneUri)).thenReturn("audio/*");
+        when(mUserManager.isSameProfileGroup(OWNER_USER_ID, OTHER_USER_ID)).thenReturn(true);
+        when(mUserManager.getProfileParent(UserHandle.of(OTHER_USER_ID))).thenReturn(
+                UserHandle.of(OWNER_USER_ID));
+        when(mUserManager.isManagedProfile(OTHER_USER_ID)).thenReturn(true);
+
+        mDefaultRingtonePreference.onSaveRingtone(mRingtoneUri);
+
+        verify(mDefaultRingtonePreference).setActualDefaultRingtoneUri(mRingtoneUri);
+    }
+
+    @Test
+    public void onSaveRingtone_defaultUri_shouldSetRingtone() {
+        mRingtoneUri = Uri.parse("default_ringtone");
+        when(mDefaultRingtonePreference.isDefaultRingtone(any(Uri.class))).thenReturn(true);
+
+        mDefaultRingtonePreference.onSaveRingtone(mRingtoneUri);
+
+        verify(mDefaultRingtonePreference).setActualDefaultRingtoneUri(mRingtoneUri);
+    }
 }