diff --git a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
index 5509e21028c98..444dc4241fa3b 100644
--- a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
+++ b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
@@ -21,7 +21,6 @@
 trait FilesystemCommonTrait
 {
     private $directory;
-    private $tmp;
 
     private function init(string $namespace, ?string $directory)
     {
@@ -92,17 +91,24 @@ private function write(string $file, string $data, int $expiresAt = null)
     {
         set_error_handler(__CLASS__.'::throwError');
         try {
-            if (null === $this->tmp) {
-                $this->tmp = $this->directory.uniqid('', true);
-            }
-            file_put_contents($this->tmp, $data);
+            $tmp = $this->directory.bin2hex(random_bytes(40));
+
+            file_put_contents($tmp, $data);
 
             if (null !== $expiresAt) {
-                touch($this->tmp, $expiresAt);
+                touch($tmp, $expiresAt);
+            }
+
+            $result = rename($tmp, $file);
+            if ($result) {
+                unset($tmp);
             }
 
-            return rename($this->tmp, $file);
+            return $result;
         } finally {
+            if (isset($tmp) && file_exists($tmp)) {
+                unlink($tmp);
+            }
             restore_error_handler();
         }
     }
@@ -178,8 +184,5 @@ public function __destruct()
         if (method_exists(parent::class, '__destruct')) {
             parent::__destruct();
         }
-        if (null !== $this->tmp && file_exists($this->tmp)) {
-            unlink($this->tmp);
-        }
     }
 }